Islamic State is mainly a direct result of the failure in Syria. That's where IS has grown. That's where IS spread from.

China, in the future, is going to have even more nuclear capability than it has had in the past. I don't believe that they have anything to fear from the United States, and I frankly don't believe they do fear the United States.

That sense of what happened in Europe in World War II has shaped a lot of my views.

The Western alliance should have supported the Sunni opposition against the Assad regime from the beginning. As far as Iraq is concerned, if it had stayed stable the way it was in 2008, IS would not have been able to expand in Iraq the way they did. The mistake was that Barack Obama withdrew the armed forces from Iraq too fast.

The truth is that for reasons that have a lot to do with the U.S. government bureaucracy, we settled on the one issue that everyone could agree on, which was weapons of mass destruction, as the core reason.

If a cat sits on a hot stove once, it will never sit on a cold one either.

The only way you can be comfortable about Donald Trump's foreign policy, is to think he doesn't really mean anything he says.