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.

It's a very bad thing when people exterminate other people, and people persecute minorities.

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

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

That sense of what happened in Europe in World War II has shaped a lot of my views.

Saddam Hussein had nerve gas and used it against his own people, he had used chemical weapons against the Iranians and he almost had a nuclear bomb in 1981 and in 1991. And he had been caught with anthrax in 1995 by the UN inspections after denying that he had it.

The American people are pretty impressive in their ability to keep after something if they think it is doable.