We have a problem with radical Islamism and I actually think that we could work together with Russia against this enemy. They have a worse problem than America does.

NATO was formed post-World War II. We're a little bit more than a half-century old. Do we want NATO to go on for another half-century? I think that the answer is, sitting here today: I don't know. If I had to bet on it, I would say, yeah, we have to have these alliances going forward and see who's going to pay for them.

I saw the relation with Russia as necessary to the U.S., for the interests of the U.S. We worked very closely with them on the Sochi Olympics. We were working closely with them on the Iranian nuclear deal.

One thing I agree with Donald Trump on is, there's something going on in the Muslim world.

I grew up as a kid with very little. I could enjoy a peanut butter and jelly sandwich or peanut butter crackers.

One of the things I learned was that Putin has no respect for the United States leadership. Not for the United States, but the leadership.

Why do three-quarters of NATO [countries] get away with not paying anything? They have to pay their bills.