I just can't vote to go to war unless I think there's a real clear-cut American purpose in the war, that we're going to win and that we're not going fight for stalemate.

I still say exactly what my original opinion is. Do you borrow money from China to send it to anyone? Out of your surplus, you can help your allies, and Israel is a great ally. And this is no particular animus of Israel, but what I will say, and I will say over and over again, we cannot give away money we don't have.

, I'm going to reserve judgment on [Rex] Tillerson. But I'll ask him the same question I've asked the others: do you understand the historic lesson that the Iraq war was a failure, a strategic mistake, that's what Donald Trump says.

Any time you make an analogy to horrific people in history, Mussolini or Hitler, people say, 'Oh, you're exaggerating, you're talking about, it's hyperbole.' Maybe it is. ... But I would say is that if you are not concerned that democracy could produce bad people, I don't think you're really thinking this through too much.

I think the vast majority of the American people say you shouldn't be able to collect my phone records if I'm not suspicious, if you don't have probable cause.

America's not the world's policeman. Terrible things happen across the globe and it is beyond our means to right every wrong. But when, with modest effort and risk, we can stop children from being gassed to death and thereby make our own children safer over the long run, I believe we should act.

I've introduced legislation to say, "For right now, let's stop it," from about 34 countries.