I go to bed at night worrying that I didn't do enough that day to make sure I protect the American people.

You always, I think, debate with yourself about whether or not you made the right decision. And you have to then give the person that you’re working for - in my instance, the president - your best judgment based on your understanding of the facts, but also the calculus you use to make a determination about what’s the best way to go forward.

I will not, nor will I ever, publicly divulge sensitive intelligence sources and methods. For when that happens, our national security is endangered and lives can be lost.

We are in this business, whether it be intelligence or the government, to protect freedom, democracy and liberty, not to violate that.

I'm neither Republican nor Democrat. I've worked for the past five administrations.

Unfortunately, in war, there are casualties, including among the civilian population.

When we uphold the rule of law, our counterterrorism tools are more likely to withstand the scrutiny of our courts, our allies, and the American people.