The potential for the next Pearl Harbor could very well be a cyber-attack.

You don't deploy forces into harm's way without knowing what's going on.

I think my best advice would be to separate Donald Trump, the president of the United States from whatever investigation is being conducted by the FBI. I mean, there is something to be said, frankly, about the need for the appointment of an independent prosecutor because the American people are entitled to have a full review of what happened as a result of what the Russians did during our election.

I suddenly realized at the CIA that I had to make life-and-death decisions about people.

The reality is that the United States military alone cannot be all things to all nations. We will sharpen the application of our resources, better deploy our forces in the world and share our burdens more and more effectively with our partners. And frankly, all our allies need to do the same.

Red lines are kind of political arguments that are used to try to put people in a corner.

The White House was so eager to rid itself of Iraq that it was willing to withdraw rather than lock in arrangements that would preserve our influence and interests.