Do you remember the Czech intel report of Atta's meetings with Iraqi intel? The CIA denies it, and continues to deny it. Czech intel has reaffirmed it and continues to stand by their story. In this case, British intel says it is so, and stands by their story. The CIA doubts it, not because it didn't happen, but because they themselves did not see it. So they now have a choice; they can believe their colleagues in British and Czech intelligence, or they can research the issue themselves, or they can just deny it out of hand, and hang the president out to dry.
Something may be going on here, more than meets the eye .