"Please tell us why the threat outlined by your intelligence community in February 1998 and again by the same people in 2001 as posing the greatest danger to the United States of America could have been completely dismissed as being imaginary."

Read the Blix and El Baradei quotes in my link. They were in the process of dismantling the evidence for the great danger, and the Bush Administration (and US and UK Intelligence it would seem - under intense political pressures documented elsewhere) "largely ignored" them.