“It is true that much of the intelligence turned out to be wrong. As president I am responsible for the decision to go into Iraq, and I am also responsible for fixing what went wrong by reforming our intelligence capabilities and we’re doing just that,” he said.
… Bush’s new admission was significant in that he rarely admits mistakes, although he has acknowledged failures in U.S. intelligence on Iraq before.
His administration touted Iraqi weapons of mass destruction as a reason for going to war in March 2003, but such weapons were never found.
At best it was the biggest screwup in American history. At best.