People change their habits. I know Americans who don't go to Paris because they think it is too dangerous.

Look, I think the notion that theres a dogma or doctrine of foreign policy that gives you a textbook recipe for how to react to all situations is really nonsense.

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

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

I think one has to say it's not just simply a matter of capturing people and holding them accountable, but removing the sanctuaries, removing the support systems...

Firing employees, that's unfortunately part of doing business.

History is just littered with problems that were solved that were supposed to be impossible.