There is a fair amount of competition, obviously, with ISIL and the terrorist networks around the world, China also posing a different kind of threat to the rules-based order.

If you represent everyone, in some ways you represent no one. You're un-owned.

My second epiphany came as an intern at the Carnegie Endowment for International Peace. The man I worked for was consumed with what was going on in Bosnia. And the more I knew [about it] the more saddened I was. There were these images of emaciated men behind barbed wire.... It was like, I've got to find a way to do something.

We, as Americans, have an interest in ensuring that the only people who get to vote for our elected leaders are our citizens, and not some foreign people who think that they have an interest in skewing our election in one direction or another.

Without investing in the rule of law for the poor, none of the other investments we make will be sustainable.

I think that the only time we will really know what then-President Trump is going to do about the set of challenges that confront him is after he has sat down with his advisers as the commander in chief, when he's looking at the threats and the intelligence from the standpoint of being the number one decider, when he's hearing from his secretary of defense, his chairman, who was the same chairman President Obama had, Chairman Joe Dunford, who is an outstanding public servant, who has led our anti-ISIL effort, on which we're making great progress.

What is most needed in Darfur is an international peacekeeping and protection presence, and this is what the Sudanese government most wants to avoid.