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.

The map isn't always the territory, and you have to kind of walk through it to get a feel for it.

Too often, we have failed to enforce international norms when it's inconvenient to do so.

We will not apologise for our way of life.

Gas tax holiday is a classic Washington gimmick.

Michelle, I love you. The other night, I think the entire country saw just how lucky I am. Malia and Sasha, you make me so proud…but don't get any ideas, you're still going to class tomorrow. And Joe Biden, thank you for being the best Vice President I could ever hope for.

Our planet is changing in ways that will have profound impacts on all of humankind.