America must always lead on the world stage.

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.

There is not a liberal America and a conservative America - there is the United States of America. There is not a black America and a white America and latino America and asian America - there's the United States of America.

One of the things I think the next president has to do is to stop fanning people's fears. If we spend all our time feeding the American people fear and conflict and division, then they become fearful and conflicted and divided. And if we feed them hope and we feed them reason and tolerance, then they will become tolerant and reasonable and hopeful.

No country can hide from the dangers of carbon pollution

My hope is that more and more investors around the world see an opportunity to do business in Greece.

That's where peace begins - not just in the plans of leaders, but in the hearts of people. Not just in some carefully designed process, but in the daily connections - that sense of empathy that takes place among those who live together in this land and in this sacred city of Jerusalem.