Well, there are many things, whenever you look back, that you would've done differently. We're all human. We do our best at the time. I really wish that we had passed a comprehensive immigration bill because that would've really helped our country. We came close, but we couldn't.

NATO is built on security, but it's also built on values.

You have to have a strong sense of your values and a strong sense of who you are, because there are a lot of events and a lot of people who will pull you in this direction or that direction.

What the United States has done hasn't always been liked or popular. But if you look at some of the most populous places in the world - China, India - the United States is not only respected but, in fact, popular.

I know that people look at my life and ask, "How can I achieve some of those things?" So, I suppose in that sense, yes, I'm a role model. But I try to think of myself more as a mentor, as somebody who I hope young people feel comfortable approaching or writing to.

Diplomacy, if properly practiced, is not just talking for the sake of talking.

America's still a very, very powerful symbol and a very important place of leadership for the world.