I'm worried about the world because of nuclear proliferation.

I'd love to have a president who really was out there leading and traveling around the world campaigning for joint climate change action. Even the Chinese government is trying to get people to stop polluting. And I think the federal government level in China is acting more responsibly than the American government.

I think that most of the candidates [for presidency] can't run the railroad, and I still worry that whoever gets elected will have policies designed for political rather than practical reasons.

I never liked anyone who didn't have a temper. If you don't have a temper, you don't have any passion.

Look at all of the great strengths of America: entrepreneurialship, work ethic, natural resources, a democracy, a transparency, a willingness to be critical. Around the world, they look at us, and they say, "Why are you criticizing yourself? Why are you people arguing during the political process to elect a president or somebody else?" That's the great strength of this country.

Go walk the streets of Beijing. It's pretty hard to argue it isn't a modern city. Now, if you go outside [of Beijing], in the rural areas, that's true. But rural America, you can say the same thing, in Appalachia there's an awful lot of poverty and lack of education.

I'm worried about the world because there's chaos in the Middle East, and I think the Iranian deal [to lift sanctions] is going to continue the Shia-Sunni battles, the Persian-Arab battles.