If Iran cheats, the world will know it.

Hope is not blind optimism. It's not ignoring the enormity of the task ahead or the roadblocks that stand in our path. It's not sitting on the sidelines or shirking from a fight. Hope is that thing inside us that insists, despite all evidence to the contrary, that something better awaits us if we have the courage to reach for it, and to work for it, and to fight for it. Hope is the belief that destiny will not be written for us, but by us, by the men and women who are not content to settle for the world as it is, who have the courage to remake the world as it should be.

It's hard to anticipate. I can tell you what I'm feeling right now is that I'm busier than I expected these last two weeks. A great deal of emotion around the people that I've worked with and the gratitude I feel for the sacrifices they've made on behalf of the American people, but also on behalf of me personally.

I'm trying to move an aircraft carrier here, I'm not just steering the speedboat.

In the first two years, when I had a strong majority in the House and the Senate, we were as productive as any administration has been since the '60s. I mean, we got a lot done.

The amount of interaction, the amount of understanding that exists in your generation among people of different races and different creeds and different colors is unprecedented. And by the way, that goes - that cuts across party lines, that cuts across partisan lines.

I don't have a philosophical objection, necessarily, to a travel ban if that is the thing that is going to keep the American people safe.