You know, if I were an - if I were a Taliban, I'd say, 'What did al-Qaida ever do for me except get me kicked out of Afghanistan?'

When I was the director of Central Intelligence in the early '90s, I tried to get the Air Force to partner with us in building drones. And they didn't want to, because they had no pilots.

I consider myself a Republican.

The reality is, the United States has global interests. Our defense budget is about the same as the defense budgets or military budgets of every other country in the world put together.

I mean, when you get down to very low numbers of nuclear weapons, and you contemplate going to zero, how do you deal with the reality of that technology being available to almost any country that seeks to pursue it? And what conditions do you put in place?

I have always voted for who I believed was the best person.

Well, I've ruffled a few feathers at all the institutions I've led. But I think that's part of leadership.