Iran . . . has failed to take the opportunity to demonstrate that its nuclear program is peaceful . . . time is not unlimited.

The changes in thinking about same-sex marriage have come slowly at first and then in rapid course. If such change is possible in this area, is it also possible in the vexed and sordid realm of race relations?

In America, we're getting too comfortable with our ability to take kinetic strikes around the world without having enough process to avoid consistently the kinds of civilian casualties that can end up actually hurting us in the war against radicalization.

In a summer marked by instability in the Middle East and Eastern Europe, I know the world also took notice of the small American city of Ferguson, Missouri - where a young man was killed, and a community was divided. So yes, we have our own racial and ethnic tensions.

Because of the internet and communications, the clash of cultures is much more direct. People feel, I think, less certain about their identity, less certain about economic security.

We're up against the conventional thinking that says your ability to lead as president comes from longevity in Washington or proximity to the White House. But we know that real leadership is about candor and judgment and the ability to rally Americans from all walks of life around a common purpose, a higher purpose.

If somebody was sending rockets into my house, where my two daughters sleep at night, I’m going to do everything in my power to stop that, and I would expect Israelis to do the same thing.