A nuclear Iran is a threat to America's national security, and it is a threat to Israel's national security. We cannot afford to have a nuclear arms race in the most volatile region of the world.

If you want a model for what is possible, if you want to see how to build a peaceful and prosperous and dynamic society, then look at Berlin and look at Germany.

I think we all know that world owes an enormous debt to Greece and the Greek people.

I do think that all politicians today have to be more attentive to people wanting to be heard, wanting to have more control over their lives.

People are less certain of their national identities or their place in the world. It starts looking different and disorienting. And there is no doubt that that has produced populist movements both from the left and from the right in many countries in Europe.

We have real enemies in the world. These enemies must be found. They must be pursued and they must be defeated.

We will respond to the threat of climate change