There's a long record here of being wrong. There's a good reason for it. There are probably multiple reasons. Certainly proliferation is a hard thing to track, particularly in countries that deny easy and free access and don't have free and open societies.

Fortunately, President Kennedy and Robert Kennedy disagreed with the estimate and chose a course of action less ambitious and aggressive than recommended by their advisers.

I've seen looting around the world and thought I knew the best looters in the world. The Iraqis excel at that.

Let me begin by saying, we were almost all wrong, and I certainly include myself here.

The Libyan program recently discovered was far more extensive than was assessed prior to that.

I am worried because I'm hearing some of the same signals about Iran and its nuclear program that were heard as the Bush administration made its case for the war in Iraq. 'It's déjà vu all over again.

There's a long record here of being wrong. There's a good reason for it. There are probably multiple reasons. Certainly proliferation is a hard thing to track, particularly in countries that deny easy and free access and don't have free and open societies.