I think it's a mistake to rely too much on any one economic factor. It's why investors try to spread their portfolio round.

I think one has to say it's not just simply a matter of capturing people and holding them accountable, but removing the sanctuaries, removing the support systems.

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.

People change their habits. I know Americans who don't go to Paris because they think it is too dangerous.

I certainly think it's important to speak up and say how unacceptable Donald Trump is. I'm always more than willing to do that.

The only way you can be comfortable about Donald Trump's foreign policy, is to think he doesn't really mean anything he says.

Look, I think the notion that theres a dogma or doctrine of foreign policy that gives you a textbook recipe for how to react to all situations is really nonsense.

I think, in the longer view of things, there is a very powerful pull in the direction of participatory government.

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.