lest we forget...
The Administration's position, once inital claims that there was no warning of the 9/11 attacks was disproven, has been that although there were in fact multiple warnings--dubbed "chatter"--including a Presidential briefing that al Qaeda hoped to hijack an aircraft a mere month before the attacks--there was no specific warning. In short, the Administration claims that since it didn't know exactly what al Qaeda was up to, it couldn't have prevented it.
(I'm not talking about the ridiculous notion that Bush deliberately allowed the attacks to occur. That concept is ridiculous on its face...but it's a straw man Bush apologists often trot out to divert attention from the fact that his administration allowed the attacks to occur through sheer incompetence.)
In the latest indication of what a massive intelligence failure 9/11 was, Reuters reported Saturday that a Taliban official--concerned that the attacks would bring the US's wrath down on his country--tried to tip off the United States consul general in Pakistan. "...a kind of warning fatigue sets in," one diplomatic source explained.
It seems the problem wasn't that there was no warning, but that there were too many...