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.

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

This [U.S.] bombing in Libya. So what are we doing in Libya? We just dropped some bombs on someone who we found is a leader there, maybe we killed some group attending a leadership meeting. Does this mean the problem is going to go away? No. It means we're going to have worse guys.

Obama's decision to leave, to not sustain the victory that resulted after eight years of fighting, from 2003 to 2011 in Iraq, was another incredibly stupid decision. It was totally based on politics, not based on any notion of national security. It's a nightmare for our national security. And then you have the Libya intervention.

We have zero strategic thinking out of our White House. And we have a national security structure that has lost its way when it comes to strategic thinking and strategic decision-making.

When you are given immunity that means that you've probably committed a crime.

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