Most people who meet my wife quickly conclude that she is remarkable. They are right about this. She is smart, funny and thoroughly charming... Often, after hearing her speak at some function or working with her on a project, people will approach me and say something to the effect of "You know, I think the world of you, Barack, but your wife... wow!"

We do not benefit from a relationship with China or any other country in which we put our values and our ideals aside.

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.

This is an extraordinary achievement, nearly nine years in the making.

The American story has never been about things coming easy. It has been about rising to the moment when the moment is hard. About rejecting panicked division for purposeful unity. About seeing a mountaintop from the deepest valley. That is why we remember that some of the most famous words ever spoken by an American came from a president who took office in a time of turmoil: "The only thing we have to fear is fear itself.

Of course I have got concerns. Donald Trump and I differ on a whole bunch of issues.

Three months is a lifetime in politics.