Bush has been warned that Bin Laden was planning to attack the US 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. In the aftermath of 9/11, Bush officials attempted to deflect criticismthat they had ignored C.I.A. warnings by saying they had not been told when...