The agency, called the Office of Special Plans (OSP), was set up by the defence secretary, Donald Rumsfeld, to second-guess CIA information and operated under the patronage of hardline conservatives in the top rungs of the administration, the Pentagon and at the White House, including Vice-President Dick Cheney.
The ideologically driven network functioned like a shadow government, much of it off the official payroll and beyond congressional oversight. But it proved powerful enough to prevail in a struggle with the State Department and the CIA by establishing a justification for war.
Mr Tenet has officially taken responsibility for the president's unsubstantiated claim in January that Saddam Hussein's regime had been trying to buy uranium in Africa, but he also said his agency was under pressure to justify a war that the administration had already decided on.
How much Mr Tenet reveals of where that pressure was coming from could have lasting political fallout for Mr Bush and his re-election prospects, which only a few weeks ago seemed impregnable. As more Americans die in Iraq and the reasons for the war are revealed, his victory in 2004 no longer looks like a foregone conclusion.
The White House counter-attacked yesterday when new chief spokesman, Scott McClellan, accused critics of "politicising the war" and trying to "rewrite history". But the Democratic leadership kept up its questions over the White House role.
The president's most trusted adviser, Mr Cheney, was at the shadow network's sharp end. He made several trips to the CIA in Langley, Virginia, to demand a more "forward-leaning" interpretation of the threat posed by Saddam.
When he was not there to make his influence felt, his chief of staff, Lewis "Scooter" Libby, was. Such hands-on involvement in the processing of intelligence data was unprecedented for a vice-president in recent times, and it put pressure on CIA officials to come up with the appropriate results.
Another frequent visitor was Newt Gingrich, the former Republican party leader who resurfaced after September 11 as a Pentagon "consultant" and a member of its unpaid defence advisory board, with influence far beyond his official title.
An intelligence official confirmed Mr Gingrich made "a couple of visits" but said there was nothing unusual about that.
Rick Tyler, Mr Gingrich's spokesman, said: "If he was at the CIA he was there to listen and learn, not to persuade or influence."
Mr Gingrich visited Langley three times before the war, and according to accounts, the political veteran sought to browbeat analysts into toughening up their assessments of Saddam's menace.
Mr Gingrich gained access to the CIA headquarters and was listened to because he was seen as a personal emissary of the Pentagon and, in particular, of the OSP.
In the days after September 11, Mr Rumsfeld and his deputy, Paul Wolfowitz, mounted an attempt to include Iraq in the war against terror. When the established agencies came up with nothing concrete to link Iraq and al-Qaida, the OSP was given the task of looking more carefully.
William Luti, a former navy officer and ex-aide to Mr Cheney, runs the day-to-day operations, answering to Douglas Feith, a defence undersecretary and a former Reagan official.
The OSP had access to a huge amount of raw intelligence. It came in part from "report officers" in the CIA's directorate of operations whose job is to sift through reports from agents around the world, filtering out the unsubstantiated and the incredible.
Under pressure from the hawks such as Mr Cheney and Mr Gingrich, those officers became reluctant to discard anything, no matter how far-fetched. The OSP also sucked in countless tips from the Iraqi National Congress and other opposition groups, which were viewed with far more scepticism by the CIA and the state department.
Allen L Roland is a practicing psychotherapist, author and lecturer who also shares a daily political and social commentary on his weblog and website allenroland.com He also guest hosts a monthly national radio show TRUTHTALK on Conscious talk radio www.conscioustalk.net
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