WASHINGTON (Reuters) - Sen. Joseph Biden, a senior Democrat, on Sunday urged Republican Sen. John McCain to run for vice president with the Democratic hopeful, Sen. John Kerry, in order to heal the "vicious rift" dividing America.

McCain, of Arizona, "categorically" ruled out standing with Kerry, but Biden, the top Democrat on the Senate Foreign Relations Committee, said he had no second choice.

"I'm sticking with McCain," Biden said.

"I think John McCain would be a great candidate for vice president," Biden, from Delaware, said on NBC's "Meet the Press," where the two senators appeared together to take questions on Iraq and other subjects.

"Do I think it's going to happen? No," he said. "But I think it is a reflection of the desire of this country and the desire of people in both parties to want to see this God-awful, vicious rift that exists in the nation healed, and John and John could go a long way to heal in that rift."

McCain, chairman of the Senate Commerce Committee and in line to take over the Senate Armed Services panel in two years, endorsed Biden's call for bridging the political gap between Democrats and Republicans.

"There's too much partisanship in America, and there's too much partisanship in the Senate," he said. "And we're not doing our job as our constituents expect us to do."

"I will always take anyone's phone calls," McCain said of any call he might get from Kerry, a fellow decorated Vietnam War veteran. "But I will not, I categorically will not do it."

Kerry said on Wednesday that McCain would be his first choice to replace Donald Rumsfeld, President Bush's secretary of defense now wrestling with the Iraqi prisoner abuse scandal.

The roots of the Abu Ghraib prison scandal lie not in the criminal inclinations of a few Army reservists but in a decision, approved last year by Secretary of Defense Donald Rumsfeld, to expand a highly secret operation, which had been focussed on the hunt for Al Qaeda, to the interrogation of prisoners in Iraq. Rumsfeld's decision embittered the American intelligence community, damaged the effectiveness of elite combat units, and hurt America's prospects in the war on terror.

According to interviews with several past and present American intelligence officials, the Pentagon’s operation, known inside the intelligence community by several code words, including Copper Green, encouraged physical coercion and sexual humiliation of Iraqi prisoners in an effort to generate more intelligence about the growing insurgency in Iraq. A senior C.I.A. official, in confirming the details of this account last week, said that the operation stemmed from Rumsfeld’s long-standing desire to wrest control of America’s clandestine and paramilitary operations from the C.I.A.

The Abu Ghraib story began, in a sense, just weeks after the September 11, 2001, attacks, with the American bombing of Afghanistan. Almost from the start, the Administration’s search for Al Qaeda members in the war zone, and its worldwide search for terrorists, came up against major command-and-control problems. For example, combat forces that had Al Qaeda targets in sight had to obtain legal clearance before firing on them. On October 7th, the night the bombing began, an unmanned Predator aircraft tracked an automobile convoy that, American intelligence believed, contained Mullah Muhammad Omar, the Taliban leader. A lawyer on duty at the United States Central Command headquarters, in Tampa, Florida, refused to authorize a strike. By the time an attack was approved, the target was out of reach. Rumsfeld was apoplectic over what he saw as a self-defeating hesitation to attack that was due to political correctness. One officer described him to me that fall as "kicking a lot of glass and breaking doors." ...

Rumsfeld reacted in his usual direct fashion: he authorized the establishment of a highly secret program that was given blanket advance approval to kill or capture and, if possible, interrogate “high value” targets in the Bush Administration’s war on terror. A special-access program, or sap—subject to the Defense Department’s most stringent level of security—was set up, with an office in a secure area of the Pentagon. ...

"Rumsfeld’s goal was to get a capability in place to take on a high-value target—a standup group to hit quickly," a former high-level intelligence official told me. "He got all the agencies together—the C.I.A. and the N.S.A.—to get pre-approval in place. Just say the code word and go." The operation had across-the-board approval from Rumsfeld and from Condoleezza Rice, the national-security adviser. President Bush was informed of the existence of the program, the former intelligence official said.

The people assigned to the program worked by the book, the former intelligence official told me. They created code words, and recruited, after careful screening, highly trained commandos and operatives from America’s élite forces—Navy seals, the Army’s Delta Force, and the C.I.A.’s paramilitary experts. They also asked some basic questions: "Do the people working the problem have to use aliases? Yes. Do we need dead drops for the mail? Yes. No traceability and no budget. And some special-access programs are never fully briefed to Congress."

In theory, the operation enabled the Bush Administration to respond immediately to time-sensitive intelligence: commandos crossed borders without visas and could interrogate terrorism suspects deemed too important for transfer to the military’s facilities at Guantánamo, Cuba. They carried out instant interrogations—using force if necessary—at secret C.I.A. detention centers scattered around the world. The intelligence would be relayed to the sap command center in the Pentagon in real time, and sifted for those pieces of information critical to the “white,” or overt, world.

Fewer than two hundred operatives and officials, including Rumsfeld and General Richard Myers, chairman of the Joint Chiefs of Staff, were “completely read into the program,” the former intelligence official said. The goal was to keep the operation protected. “We’re not going to read more people than necessary into our heart of darkness,” he said. “The rules are ‘Grab whom you must. Do what you want.’”

One Pentagon official who was deeply involved in the program was Stephen Cambone, who was named Under-Secretary of Defense for Intelligence in March, 2003. The office was new; it was created as part of Rumsfeld’s reorganization of the Pentagon. Cambone was unpopular among military and civilian intelligence bureaucrats in the Pentagon, essentially because he had little experience in running intelligence programs, though in 1998 he had served as staff director for a committee, headed by Rumsfeld, that warned of an emerging ballistic-missile threat to the United States. He was known instead for his closeness to Rumsfeld. “Remember Henry II—‘Who will rid me of this meddlesome priest?’” the senior C.I.A. official said to me, with a laugh, last week. “Whatever Rumsfeld whimsically says, Cambone will do ten times that much.”

Cambone was a strong advocate for war against Iraq. He shared Rumsfeld’s disdain for the analysis and assessments proffered by the C.I.A., viewing them as too cautious, and chafed, as did Rumsfeld, at the C.I.A.’s inability, before the Iraq war, to state conclusively that Saddam Hussein harbored weapons of mass destruction. Cambone’s military assistant, Army Lieutenant General William G. (Jerry) Boykin, was also controversial. Last fall, he generated unwanted headlines after it was reported that, in a speech at an Oregon church, he equated the Muslim world with Satan.

Early in his tenure, Cambone provoked a bureaucratic battle within the Pentagon by insisting that he be given control of all special-access programs that were relevant to the war on terror. Those programs, which had been viewed by many in the Pentagon as sacrosanct, were monitored by Kenneth deGraffenreid, who had experience in counter-intelligence programs. Cambone got control, and deGraffenreid subsequently left the Pentagon. ...

By then, the war in Iraq had begun. The sap was involved in some assignments in Iraq, the former official said. C.I.A. and other American Special Forces operatives secretly teamed up to hunt for Saddam Hussein and—without success—for Iraqi weapons of mass destruction. But they weren’t able to stop the evolving insurgency.

The solution, endorsed by Rumsfeld and carried out by Stephen Cambone, was to get tough with those Iraqis in the Army prison system who were suspected of being insurgents. A key player was Major General Geoffrey Miller, the commander of the detention and interrogation center at Guantánamo, who had been summoned to Baghdad in late August to review prison interrogation procedures. The internal Army report on the abuse charges, written by Major General Antonio Taguba in February, revealed that Miller urged that the commanders in Baghdad change policy and place military intelligence in charge of the prison. The report quoted Miller as recommending that “detention operations must act as an enabler for interrogation.”

Miller’s concept, as it emerged in recent Senate hearings, was to “Gitmoize” the prison system in Iraq—to make it more focussed on interrogation. He also briefed military commanders in Iraq on the interrogation methods used in Cuba—methods that could, with special approval, include sleep deprivation, exposure to extremes of cold and heat, and placing prisoners in “stress positions” for agonizing lengths of time. (The Bush Administration had unilaterally declared Al Qaeda and other captured members of international terrorist networks to be illegal combatants, and not eligible for the protection of the Geneva Conventions.)

Rumsfeld and Cambone went a step further, however: they expanded the scope of the sap, bringing its unconventional methods to Abu Ghraib. The commandos were to operate in Iraq as they had in Afghanistan. The male prisoners could be treated roughly, and exposed to sexual humiliation.

“They weren’t getting anything substantive from the detainees in Iraq,” the former intelligence official told me. “No names. Nothing that they could hang their hat on. Cambone says, I’ve got to crack this thing and I’m tired of working through the normal chain of command. I’ve got this apparatus set up—the black special-access program—and I’m going in hot. So he pulls the switch, and the electricity begins flowing last summer. And it’s working. We’re getting a picture of the insurgency in Iraq and the intelligence is flowing into the white world. We’re getting good stuff. But we’ve got more targets”—prisoners in Iraqi jails—“than people who can handle them.”

Cambone then made another crucial decision, the former intelligence official told me: not only would he bring the sap’s rules into the prisons; he would bring some of the Army military-intelligence officers working inside the Iraqi prisons under the sap’s auspices. “So here are fundamentally good soldiers—military-intelligence guys—being told that no rules apply,” the former official, who has extensive knowledge of the special-access programs, added. “And, as far as they’re concerned, this is a covert operation, and it’s to be kept within Defense Department channels.”

The military-police prison guards, the former official said, included “recycled hillbillies from Cumberland, Maryland.” He was referring to members of the 372nd Military Police Company. Seven members of the company are now facing charges for their role in the abuse at Abu Ghraib. “How are these guys from Cumberland going to know anything? The Army Reserve doesn’t know what it’s doing.”

Who was in charge of Abu Ghraib—whether military police or military intelligence—was no longer the only question that mattered. Hard-core special operatives, some of them with aliases, were working in the prison. The military police assigned to guard the prisoners wore uniforms, but many others—military intelligence officers, contract interpreters, C.I.A. officers, and the men from the special-access program—wore civilian clothes. It was not clear who was who, even to Brigadier General Janis Karpinski, then the commander of the 800th Military Police Brigade, and the officer ostensibly in charge. “I thought most of the civilians there were interpreters, but there were some civilians that I didn’t know,” Karpinski told me. “I called them the disappearing ghosts. I’d seen them once in a while at Abu Ghraib and then I’d see them months later. They were nice—they’d always call out to me and say, ‘Hey, remember me? How are you doing?’” The mysterious civilians, she said, were “always bringing in somebody for interrogation or waiting to collect somebody going out.” Karpinski added that she had no idea who was operating in her prison system. (General Taguba found that Karpinski’s leadership failures contributed to the abuses.)

By fall, according to the former intelligence official, the senior leadership of the C.I.A. had had enough. “They said, ‘No way. We signed up for the core program in Afghanistan—pre-approved for operations against high-value terrorist targets—and now you want to use it for cabdrivers, brothers-in-law, and people pulled off the streets’”—the sort of prisoners who populate the Iraqi jails. “The C.I.A.’s legal people objected,” and the agency ended its sap involvement in Abu Ghraib, the former official said.

The C.I.A.’s complaints were echoed throughout the intelligence community. There was fear that the situation at Abu Ghraib would lead to the exposure of the secret sap, and thereby bring an end to what had been, before Iraq, a valuable cover operation. “This was stupidity,” a government consultant told me. “You’re taking a program that was operating in the chaos of Afghanistan against Al Qaeda, a stateless terror group, and bringing it into a structured, traditional war zone. Sooner or later, the commandos would bump into the legal and moral procedures of a conventional war with an Army of a hundred and thirty-five thousand soldiers.”

The former senior intelligence official blamed hubris for the Abu Ghraib disaster. “There’s nothing more exhilarating for a pissant Pentagon civilian than dealing with an important national security issue without dealing with military planners, who are always worried about risk,” he told me. “What could be more boring than needing the coöperation of logistical planners?” The only difficulty, the former official added, is that, “as soon as you enlarge the secret program beyond the oversight capability of experienced people, you lose control. We’ve never had a case where a special-access program went sour—and this goes back to the Cold War.”

In a separate interview, a Pentagon consultant, who spent much of his career directly involved with special-access programs, spread the blame. “The White House subcontracted this to the Pentagon, and the Pentagon subcontracted it to Cambone,” he said. “This is Cambone’s deal, but Rumsfeld and Myers approved the program.” When it came to the interrogation operation at Abu Ghraib, he said, Rumsfeld left the details to Cambone. Rumsfeld may not be personally culpable, the consultant added, “but he’s responsible for the checks and balances. The issue is that, since 9/11, we’ve changed the rules on how we deal with terrorism, and created conditions where the ends justify the means.”

The notion that Arabs are particularly vulnerable to sexual humiliation became a talking point among pro-war Washington conservatives in the months before the March, 2003, invasion of Iraq. One book that was frequently cited was “The Arab Mind,” a study of Arab culture and psychology, first published in 1973, by Raphael Patai, a cultural anthropologist who taught at, among other universities, Columbia and Princeton, and who died in 1996. The book includes a twenty-five-page chapter on Arabs and sex, depicting sex as a taboo vested with shame and repression. “The segregation of the sexes, the veiling of the women . . . and all the other minute rules that govern and restrict contact between men and women, have the effect of making sex a prime mental preoccupation in the Arab world,” Patai wrote. Homosexual activity, “or any indication of homosexual leanings, as with all other expressions of sexuality, is never given any publicity. These are private affairs and remain in private.” The Patai book, an academic told me, was “the bible of the neocons on Arab behavior.” In their discussions, he said, two themes emerged—“one, that Arabs only understand force and, two, that the biggest weakness of Arabs is shame and humiliation.”

The government consultant said that there may have been a serious goal, in the beginning, behind the sexual humiliation and the posed photographs. It was thought that some prisoners would do anything—including spying on their associates—to avoid dissemination of the shameful photos to family and friends. The government consultant said, “I was told that the purpose of the photographs was to create an army of informants, people you could insert back in the population.” The idea was that they would be motivated by fear of exposure, and gather information about pending insurgency action, the consultant said. If so, it wasn’t effective; the insurgency continued to grow.

“This shit has been brewing for months,” the Pentagon consultant who has dealt with saps told me. “You don’t keep prisoners naked in their cell and then let them get bitten by dogs. This is sick.” The consultant explained that he and his colleagues, all of whom had served for years on active duty in the military, had been appalled by the misuse of Army guard dogs inside Abu Ghraib. “We don’t raise kids to do things like that. When you go after Mullah Omar, that’s one thing. But when you give the authority to kids who don’t know the rules, that’s another.”

In 2003, Rumsfeld’s apparent disregard for the requirements of the Geneva Conventions while carrying out the war on terror had led a group of senior military legal officers from the Judge Advocate General’s (jag) Corps to pay two surprise visits within five months to Scott Horton, who was then chairman of the New York City Bar Association’s Committee on International Human Rights. “They wanted us to challenge the Bush Administration about its standards for detentions and interrogation,” Horton told me. “They were urging us to get involved and speak in a very loud voice. It came pretty much out of the blue. The message was that conditions are ripe for abuse, and it’s going to occur.” The military officials were most alarmed about the growing use of civilian contractors in the interrogation process, Horton recalled. “They said there was an atmosphere of legal ambiguity being created as a result of a policy decision at the highest levels in the Pentagon. The jag officers were being cut out of the policy formulation process.” They told him that, with the war on terror, a fifty-year history of exemplary application of the Geneva Conventions had come to an end.

The abuses at Abu Ghraib were exposed on January 13th, when Joseph Darby, a young military policeman assigned to Abu Ghraib, reported the wrongdoing to the Army’s Criminal Investigations Division. He also turned over a CD full of photographs. Within three days, a report made its way to Donald Rumsfeld, who informed President Bush.

The inquiry presented a dilemma for the Pentagon. The C.I.D. had to be allowed to continue, the former intelligence official said. "You can’t cover it up. You have to prosecute these guys for being off the reservation. But how do you prosecute them when they were covered by the special-access program? So you hope that maybe it’ll go away." The Pentagon’s attitude last January, he said, was "Somebody got caught with some photos. What’s the big deal? Take care of it." Rumsfeld’s explanation to the White House, the official added, was reassuring: "'We’ve got a glitch in the program. We’ll prosecute it.' The cover story was that some kids got out of control." ...

This official went on, “The black guys”—those in the Pentagon’s secret program—“say we’ve got to accept the prosecution. They’re vaccinated from the reality.” The sap is still active, and “the United States is picking up guys for interrogation. The question is, how do they protect the quick-reaction force without blowing its cover?” The program was protected by the fact that no one on the outside was allowed to know of its existence. “If you even give a hint that you’re aware of a black program that you’re not read into, you lose your clearances,” the former official said. “Nobody will talk. So the only people left to prosecute are those who are undefended—the poor kids at the end of the food chain.”

The most vulnerable senior official is Cambone. “The Pentagon is trying now to protect Cambone, and doesn’t know how to do it,” the former intelligence official said.

Last week, the government consultant, who has close ties to many conservatives, defended the Administration’s continued secrecy about the special-access program in Abu Ghraib. “Why keep it black?” the consultant asked. “Because the process is unpleasant. It’s like making sausage—you like the result but you don’t want to know how it was made. Also, you don’t want the Iraqi public, and the Arab world, to know. Remember, we went to Iraq to democratize the Middle East. The last thing you want to do is let the Arab world know how you treat Arab males in prison.”

The former intelligence official told me he feared that one of the disastrous effects of the prison-abuse scandal would be the undermining of legitimate operations in the war on terror, which had already suffered from the draining of resources into Iraq. He portrayed Abu Ghraib as “a tumor” on the war on terror. He said, “As long as it’s benign and contained, the Pentagon can deal with the photo crisis without jeopardizing the secret program. As soon as it begins to grow, with nobody to diagnose it—it becomes a malignant tumor.”

The Pentagon consultant made a similar point. Cambone and his superiors, the consultant said, “created the conditions that allowed transgressions to take place. And now we’re going to end up with another Church Commission”—the 1975 Senate committee on intelligence, headed by Senator Frank Church, of Idaho, which investigated C.I.A. abuses during the previous two decades. Abu Ghraib had sent the message that the Pentagon leadership was unable to handle its discretionary power. “When the shit hits the fan, as it did on 9/11, how do you push the pedal?” the consultant asked. “You do it selectively and with intelligence.”

“Congress is going to get to the bottom of this,” the Pentagon consultant said. “You have to demonstrate that there are checks and balances in the system.” He added, “When you live in a world of gray zones, you have to have very clear red lines.”

Senator John McCain, of Arizona, said, “If this is true, it certainly increases the dimension of this issue and deserves significant scrutiny. I will do all possible to get to the bottom of this, and all other allegations.”

“In an odd way,” Kenneth Roth, the executive director of Human Rights Watch, said, “the sexual abuses at Abu Ghraib have become a diversion for the prisoner abuse and the violation of the Geneva Conventions that is authorized.” Since September 11th, Roth added, the military has systematically used third-degree techniques around the world on detainees. “Some jags hate this and are horrified that the tolerance of mistreatment will come back and haunt us in the next war,” Roth told me. “We’re giving the world a ready-made excuse to ignore the Geneva Conventions. Rumsfeld has lowered the bar.”