This article in The New York Times is right on target.
Pre-9/11 Files Show Warnings Were More Dire and Persistent The New York Times (18 April 2004)
¶Al Qaeda and its leader, Mr. bin Laden, did not blindside the United States, but were a threat recognized and discussed regularly at the highest levels of government for nearly five years before the attacks, in thousands of reports, often accompanied by urgent warnings from lower-level experts.
¶Presidents Clinton and Bush received regular information about the threat of Al Qaeda and the intention of the bin Laden network to strike inside the United States. Each president made terrorism a stated priority, failed to find a diplomatic solution and viewed military force as a last resort. At the same time, neither grappled with the structural flaws and paralyzing dysfunction that undermined the C.I.A. and the F.B.I., the two agencies on which the nation depended for protection from terrorists. By the end of his second term, Mr. Clinton and the director of the F.B.I., Louis J. Freeh, were barely speaking
Pre-9/11 Files Show Warnings Were More Dire and Persistent The New York Times (18 April 2004)
¶Al Qaeda and its leader, Mr. bin Laden, did not blindside the United States, but were a threat recognized and discussed regularly at the highest levels of government for nearly five years before the attacks, in thousands of reports, often accompanied by urgent warnings from lower-level experts.
¶Presidents Clinton and Bush received regular information about the threat of Al Qaeda and the intention of the bin Laden network to strike inside the United States. Each president made terrorism a stated priority, failed to find a diplomatic solution and viewed military force as a last resort. At the same time, neither grappled with the structural flaws and paralyzing dysfunction that undermined the C.I.A. and the F.B.I., the two agencies on which the nation depended for protection from terrorists. By the end of his second term, Mr. Clinton and the director of the F.B.I., Louis J. Freeh, were barely speaking