Nothing keeps me awake at night. I keep other people awake at night.

PowerPoint makes us stupid.

We are going to have to continue to keep the pressure on the enemy. There is no room for complacency on this.

There are some people who think you have to hate them in order to shoot them. I don't think you do. It's just business.

The most important six inches on the battlefield is between your ears.

General [James] Mattis's primary experience - indeed, his only experience - is as a member of the United States Marine Corps, where he served for 41 years. That's his experience.

Once ISIS is defeated, there is a larger effort under way to make certain that we don't just sprout a new enemy. We know ISIS is going to go down. We have had success on the battlefield. We have freed millions of people from being under their control.