White House Press Secretary Scott McClellan, 03/22/2004:
"There's no record of the President being in the Situation Room on that day that [the exchange with Richard Clarke] was alleged to have happened, on the day of September the 12th. When the President is in the Situation Room, we keep track of that."
"THERE'S NO RECORD OF THE PRESIDENT BEING IN THE SITUATION ROOM" on 9/12/2001.