We did not go to war in Afghanistan or in Iraq to, quote, 'impose democracy.' We went to war in both places because we saw those regimes as a threat to the United States.

Every math curriculum in the world is based on the idea of hand-calculating, and most of what you're teaching is how to calculate. And I think the resistance to this is very variable.

The use of force to liberate people is very different from the use of force to suppress or control them, or even to defeat them.

Jobs are a priority for every country. Doing more to improve regulation and help entrepreneurs is the key to creating jobs - and more growth.

Public action should seek to expand the set of opportunities of those who have the least voice and fewest resources and capabilities.

I wish there were somebody I could be comfortable voting for. I might have to vote for Hillary Clinton, even though I have big reservations about her.

One of the things that ultimately led me to leave mathematics and go into political science was thinking I could prevent nuclear war.