Bush did have warning

The August 6th version of the President's Daily Brief seems to have contained some rather specific warnings that al-Qaeda planned to hijack aircraft in the United States. Combined with previously available information (including that the use of aircraft as weapons was taken seriously enough to deploy AAA around Genoa during the G8 summit in 2001), it is obvious that the Bush Administration sat on its hands regarding terrorism, especially given the testimony of Dr. Rice and Richard Clarke.

Don't let Dr. Rice or the White House trick you into believing that they were doing everything they could, or that it was an earlier President's fault. Although previous Administrations didn't do enough, they had plans and committment to the issue of terrorism. The Bush White House junked existing plans, ignored their experts, and then sat on the ideas they did develop in favor of "sexier" pet projects like Missile Defense -- a topic Dr. RIce was going to address on Sept. 11th, but didn't due to the attacks.