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

[Young people] are showing enormous and entrepreneurship and working with each other across borders.

I think I'm the best president I've ever been right now. And I think the team that is operating right now functions as well as any team that I've had. And so, you know, there is a part of you that thinks, "Man, we're pretty good at this stuff right now." And you hate to see that talent disperse.

The United States often finds itself in a situation where if it goes in militarily then it is criticized for going in militarily, and if it doesn't go in militarily, then people say, why aren't you doing something militarily?

Well, Governor, we also have fewer horses and bayonets.

Those who are already feeling the effects of climate change don't have time to deny it - they're busy dealing with it.

We will not apologise for our way of life.