The larger picture here is that a North Korea with nuclear weapons adds to the larger proliferation risk.

Well, I think by any expectation South Africa has come a tremendously long way. We've seen a society that many people thought couldn't withstand a peaceful transition to democracy without a great deal of violence, in fact, make that transition and do it in relative peace and security.

Focus on something that stirs your soul, it's hard to excel at anything that you don't love.

I like to think that with me, what you see is what you get, and you can like or dislike it, it's up to you, but it's straight. That's something that I pride myself on.

I don't have time to think about the false controversy.

Can I be blunt? Yes. Can I be diplomatic? Yes. Can I concoct a mixture of vinegar and honey when the circumstances warrant? Yes.

It is manifestly in the interest of the United States to deal with the very real threat that climate change poses. And that's why President Obama has worked so hard to reduce our own emissions and to lead internationally in forging the Paris climate agreement.