ISIS is on its way to defeat but terrorism threat persists.

The job of the leader is to get the big ideas right.

There has, indeed, been very substantial progress in Iraq over the past year - violence is down by 80 percent, civilian deaths by about the same, and so on.

I am not a politician, and I will never be, and I say that with absolute conviction.

Fighting in cities is a totally different endeavor than obviously fighting out in the open.

The Islamic State fighters in Mosul are dead men walking and I think they increasingly know it.

I think Putin wants to recreate as much of the Soviet Union as he can through a variety of different means. He's invaded parts of Georgia, took Crimea, southeastern Ukraine, bases in other countries.