[twoodfin]

There was a cottage industry in elaborating the theory that Bush and his administration were unnecessarily caught flat-footed or even knew the attacks were imminent.

Richard Clarke is a good place to start:

https://en.wikipedia.org/wiki/Richard_A._Clarke

He seemed more interested in publicity and exaggerating his own bureaucratic importance than being objective—tendencies the political opposition and media were in no mood to criticize.

But YMMV.