It's in our interest to continue with the Paris Agreement and to deal with climate change as the real threat it actually is.

What we have done is when the threat has been directed at the United States, i.e., the terrorist threat from ISIL or Al-Qaeda in Syria, is to go after them.

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

I have a range, and I'd much rather do things the nice way than the hard way, but sometimes you have to use all the tools at your disposal.

What I learned is that policymakers have to force consideration of actions that may not have occurred to them at the time.

I have no regrets whatsoever that I have acted in a way to advance my country's interests

The youth thing never really, from my vantage point, slowed me down. I think the harder audience for me to gain acceptance from was the career diplomatic corps that worked with and for me in the Africa Bureau.