[White House] feels even more like home now because you have all these memories that were formed watching your kids grow up.

There are folks who will equivocate. They'll say, 'You know, I'm not a scientist.' Well, I'm not either. But the best scientists in the world know that climate change is happening.

Physically, I feel probably as good as I've ever felt. And I've got as much energy as I ever did. But what you feel after eight years - and I think you'd feel this no matter what, but anytime you have a big transition, it gets magnified - is time passes.

Our founders made it extraordinarily difficult to amend the Constitution.

That sort of lack of awareness on the part of an activist about the constraints of our political system and the constraints on this office, I think, sometimes would leave me to mutter under my breath. Very rarely did I lose it publicly. Yeah, usually I'd just smile.

Obviously, if Congress wants to talk about anything, we're happy to provide information. We're committed to moving forward under the current act.

My hope and expectation is that regardless of what Donald Trump said during the campaign, he's going to have to look carefully at the realities when he moves forward.