BTW...you can be assured that the President and his national security team are not functioning on superstition and rumor.
Officials at that level don't talk of mushroom clouds over American cities on a whim. They have ALL of the available information, and I have no doubt at all...none...that it is clear that Iraq is an imminent threat.
Officials at that level have a very long history of "adjusting" the facts in order to achieve a political result which might or might not be apparent.