I continue to believe when I said in Hanover, that the E.U. remains one of the world's great political and economic achievements, and that those achievements should not be taken for granted.

Donald Trump is like Hillary Clinton said, a man you can bait with a tweet is not a man you can trust with nuclear weapons. You can`t do it.

The absence of hope can rot a society from within.

That's the true genius of America: that America can change. Our union can be perfected. What we've already achieved gives us hope for what we can and must achieve tomorrow.

There is a big risk for the Republicans in a race, especially with Hillary Clinton as a likely Democratic nominee in a contest that will focus on the possibility of the first woman president to be six months suspending up the nomination of a black woman, who is imminently qualified.

I warn young people that I interact with about this - you get into unrealistic expectations where you think that, "Oh, we're gonna eliminate racism like that. After Obama's elected how could there be any racism?".

More than a building that houses books and data, the library represents a window to a larger world, the place where we've always come to discover big ideas and profound concepts that help move the American story forward and the human story forward.