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.

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

After a regime is removed, however, it is dangerous to leave a security vacuum.

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

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.

Putin is behaving in a very dangerous way. And Donald Trump sounds as though he would simply sit back and allow that to go on. I worry about where that would end up.