It's declassified.
http://www.thesmokinggun.com/archive/0409041pdb1.html
In under a page and a half, it observes there are operatives in the U.S., mentions hijackings twice and surveillance of federal buildings in New York by al-Quaeda...
How would you react as President? Wait for confirmation? Ask about airport security? Review all security activities with your top advisors? End your vacation?
Be real, now. Try to keep the Monday morning quarterbacking to a minimum. Previous PDBs have also mentioned al Quaeda activities.