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.

Firing employees, that's unfortunately part of doing business.

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

Islamic State is mainly a direct result of the failure in Syria. That's where IS has grown. That's where IS spread from.

For one thing I tend not to see myself in various moulds that people fit me into.

The Bernie Sanders phenomenon shows that it's not confined to Republicans. There is a general sentiment that America is on the wrong track.

There's a lot of money to pay for this ... the oil revenues of that country could bring between $50 and $100 billion over the course of the next two or three years...We're dealing with a country that can really finance its own reconstruction, and relatively soon.