The idea that Sudan could buy and make use of extremely sophisticated nuclear technology is obviously a question mark.

I think they're worried they're going to end up in the middle of a shooting war between their brethren, the North Koreans, and the Americans, who may not really care about what a war would do to South Korea.

A compromise by North Korea would negatively affect Iran's positions.

Iraq continues to possess several tons of chemical weapons agents, enough to kill thousands and thousands of civilians or soldiers.

If the five or six bombs' worth of plutonium they are sitting on ends up going into nuclear weapons, then I think we are really reaching a watershed moment where the U.S., its troops in the region and its allies are threatened by a nuclear North Korea, with, I think, very significant regional and global consequences.

People in the U.S. who think of and worry about Russia's nuclear weapons are a fraction of what they were during the Cold War, ... That interest or anxiety is simply not something that drives U.S. policy any more.

If Iran does become nuclear we do know for a fact that they have ties to terrorist organizations and we have a leadership there that has made it clear that they want to change the status quo in the region, including Israel's existence. And that's something that nobody's going to be comfortable with.

The concern is they either have on hand -- or could quickly re-create the capability to produce -- vast amounts of anthrax, tons of material, compared with the several grams of material that literally shut down the U.S. postal system last year.