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IT was perhaps the most famous presidential briefing in history.

On Aug. 6, 2001, President George W. Bush received a classified review of the threats posed by Osama bin Laden and his terrorist network, Al Qaeda. That morning’s “presidential daily brief” — the top-secret document prepared by America’s intelligence agencies — featured the now-infamous heading: “Bin Laden Determined to Strike in U.S.” A few weeks later, on 9/11, Al Qaeda accomplished that goal.

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The direct warnings to Mr. Bush about the possibility of a Qaeda attack began in the spring of 2001. By May 1, the Central Intelligence Agency told the White House of a report that “a group presently in the United States” was planning a terrorist operation. Weeks later, on June 22, the daily brief reported that Qaeda strikes could be “imminent,” although intelligence suggested the time frame was flexible.

But some in the administration considered the warning to be just bluster. An intelligence official and a member of the Bush administration both told me in interviews that the neoconservative leaders who had recently assumed power at the Pentagon were warning the White House that the C.I.A. had been fooled; according to this theory, Bin Laden was merely pretending to be planning an attack to distract the administration from Saddam Hussein, whom the neoconservatives saw as a greater threat. Intelligence officials, these sources said, protested that the idea of Bin Laden, an Islamic fundamentalist, conspiring with Mr. Hussein, an Iraqi secularist, was ridiculous, but the neoconservatives’ suspicions were nevertheless carrying the day.

In response, the C.I.A. prepared an analysis that all but pleaded with the White House to accept that the danger from Bin Laden was real.

“The U.S. is not the target of a disinformation campaign by Usama Bin Laden,” the daily brief of June 29 read, using the government’s transliteration of Bin Laden’s first name. Going on for more than a page, the document recited much of the evidence, including an interview that month with a Middle Eastern journalist in which Bin Laden aides warned of a coming attack, as well as competitive pressures that the terrorist leader was feeling, given the number of Islamists being recruited for the separatist Russian region of Chechnya.

And the C.I.A. repeated the warnings in the briefs that followed. Operatives connected to Bin Laden, one reported on June 29, expected the planned near-term attacks to have “dramatic consequences,” including major casualties. On July 1, the brief stated that the operation had been delayed, but “will occur soon.” Some of the briefs again reminded Mr. Bush that the attack timing was flexible, and that, despite any perceived delay, the planned assault was on track.

Yet, the White House failed to take significant action.