Bush is trying to tell everyone that he wasn't made aware of the findings of the NIE that said Iran shut down its nuke program in 2003. Joe Biden calls him on it:

“Are you telling me a president who is briefed every single morning, who is fixated on Iran, is not told back in August that the tentative conclusion of 16 intelligence agencies in the United States government said they had abandoned their effort for a nuclear weapon in ’03?” Biden said in a conference call with reporters.

“That’s not believable,” Biden added. “I refuse to believe that. If that’s true, he has the most incompetent staff in … modern American history and he’s one of the most incompetent presidents in modern American history.”