I think it is manmade. I think it's clearly manmade. If you don't understand what the cause is, it's virtually impossible to come up with a solution. We know what the cause is. The cause is manmade. That's the cause. That's why the polar icecap is melting.

I always judge people who spend a lot of time in public office say they care about things, if the day after they leave, they no longer talk about them, then I don't think they cared much about them.

I'm joking, I'm joking. Best decision I ever made.

I also acknowledge that prejudice runs very deep in our society. And, in the real world, discrimination rears its ugly head in the shadows, where it's very difficult to root it out.

There's one advantage in having been around as long as I have. Everybody in the Senate knows me, and - I'm going to say something presumptuous, to repeat myself - I think most respect me.

Should we have border security there? Yes. But the idea of the United States erecting a wall for the world to see makes a lie of everything we say about ourselves. It's a little bit like why the President [Barack Obama] and I feel so strongly about closing Guantanamo. It is inconsistent with who we are.

I travel a lot on foreign policy, as you know. I'm in Europe a lot. I travelled over a million miles as vice president. They didn't do stimulus. Look where they are. Come on. I mean, this is like, I just get so frustrated. Like come on.