The area of climate change has a dramatic impact on national security.

I don't usually comment on columnists' ideas of what I'm thinking. That's a dangerous game to get into.

I know that young people sometimes, caught up in the moment, make some very foolish decisions.

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

Well look, CIA is an agency that has to collect intelligence, do operations. We have to take risks and it's important that we take risks and that we know that we have the support of the government and we have the support of the American people in what we're doing.

My experience is that the director of the FBI is particularly important to just how aggressive an investigation will be into an issue. And once you remove James Comey, it creates a vacuum at the top. And the fundamental issue will be whether or not there is support at the highest levels within the FBI to continue to conduct that investigation. That's going to be the question mark.

Companies should be able to share specific threat information with the government without the prospect of lawsuits hanging over their head.