Bush had multiple warnings given to him about an incoming attack. They were even on the radar screen of the FBI, who did nothing.
If only there had been some hard evidence. Like a previous attack on the towers, or an attack on one of our naval assets
...
George W. wasn’t paying attention to Al Qaeda in 2001 because he was too busy trying to give amnesty to illegal Mexicans.
BUSH AIDES WEIGH LEGALIZING STATUS OF MEXICANS IN U.S. (July 15, 2001)
http://www.freerepublic.com/focus/f-news/3350127/posts