I honestly don't remember anyone vilifying Clinton for not foreseeing the first WTC attack or the attack on the embassies or the Cole. In retrospect, however, there were all kinds of posible warning signs. But how could he (or his administration) have stopped those attacks? How could Bush have stopped the 9/11 attacks with the information available? For those who are saying he could have done something, exactly what is that?
What was known:
CIA suggested that Al Qaeda may be looking to hijack a plane (or planes), most likely abroad.
FBI? posted a report that Middle-Easterners may be learning to fly commercial jets in the U.S. with bad intentions.
OBL warned of upcoming attacks by video tape (which he had been doing for a while and wich came true twice...embassies and Cole)
What the administration did:
Notified FAA and SecTrans who in turn notified the airlines of possible hijack theat.
Increased security at military bases and embassies abroad.
(this was all brought up at todays White House press briefing and not in dispute)