I think, on the foreign policy side, that there is a need for disruption. We've had three administrations follow a pretty consistent policy toward North Korea, and it really hasn't gotten us anywhere.

I fired a lot of senior people myself and I think the key, when you feel compelled to remove a senior official, is essentially to have all your ducks in a row at the beginning. Have everybody understand what the rationale was.

When I was the director of Central Intelligence in the early '90s, I tried to get the Air Force to partner with us in building drones. And they didn't want to, because they had no pilots.

There will be boots on the ground if there's to be any hope of success in the strategy.

One of my favorite little sayings is, 'To avoid criticism, say nothing, do nothing, be nothing.

I have tried to maintain civil relationships with everyone I meet - and, even if I violently disagree with them, try to be respectful.

The United States has been a global power since late in the 19th century.