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

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.

Progress is the product of human agency. Things get better because we make them better. Things go wrong when we get too comfortable, when we fail to take risks or seize opportunities.

I think people have confidence that I will fairly and accurately represent their point of view to the President, and that I'm not going to put a spin on it, even if I may disagree with it.

I think most Americans understand that we went through a period in which American leadership was judged quite critically internationally.

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.

We must be honest in acknowledging that neither Germany nor the US has the luxury of assuming that we can skate by on half-measures in Afghanistan and Pakistan and not risk suffering the consequences.