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

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

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.

I think Obama sees everything through one lens. Doing nothing in the face of the slaughter in Syria is not only shameful, it is unrealistic. This approach leaves Syria as a broken country and a breeding ground for extremists for decades.

You cant win if youre chasing the wrong problem.

NATO is still the most remarkable alliance in history. It stuck together through 40 years of Cold War, and it then joined together to fight in Afghanistan. In the 1980s, I would not have thought this was going to be possible.

The absence of Saddam is a huge weight off the Arab world.