He cited the confidence that the United States said it had a decade ago when it argued that Iraq had weapons of mass destruction.
It's an argument Kerry was prepared for before Congress on Tuesday.
He noted that he and Hagel were senators at the time of the Iraq vote.
"And so we are especially sensitive, Chuck and I, to never again asking any member of Congress to take a vote on faulty intelligence. And that is why our intelligence community has scrubbed and re-scrubbed the evidence."