I don't have much patience for anyone who denies that this challenge is real.

I have somehow, continued to miss Oktoberfest so that's probably something that is better for me to do as a former president rather than as president, I'll have more fun.

Angela [Merkel] and I also agreed the need for a comprehensive and humane response to the devastating humanitarian crisis in Syria and for the influx of migrants and refugees from around the world. We need to build on the progress achieved at the U.N. Refugee Summit, which yielded new commitments from some 50 nations and organizations.

The greatest threat to U.S. and global security is no longer a nuclear exchange between nations, but nuclear terrorism by violent extremists and nuclear proliferation to an increasing number of states.

At least Romney and McCain, they respect the rule of law. At least Romney and McCain, they understand their limitations.

My wife has been my closest friend, my closest advisor. And ... she's not somebody who looks to the limelight, or even is wild about me being in politics. And that's a good reality check on me. When I go home, she wants me to be a good father and a good husband. And everything else is secondary to that.

My job to the Muslim world is to communicate that the Americans are not your enemy. We sometimes make mistakes. We have not been perfect.