Most governments lie to each other. That's the way business gets done.

If there's ever an example that military power alone cannot be successful in Afghanistan, I think it was the Soviet experience.

I consider myself a Republican.

I think, on the foreign policy side, that there is a need for disruption. We've had three administrations follow a pretty consistent policy toward North Korea, and it really hasn't gotten us anywhere.

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 will always be an advocate in terms of wars of necessity. I am just much more cautious on wars of choice.

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.