President Obama is funny, he's thoughtful, he's challenging, he's fun to work with - and it's been an extraordinary privilege.

I have a range, and I'd much rather do things the nice way than the hard way, but sometimes you have to use all the tools at your disposal.

I'm sort of in this rhythm where we want to make the most of the time we have, but when it's done it will be time for it to be done.

The United States share of the African market it's very small, it's only about 8 percent.

It is manifestly in the interest of the United States to deal with the very real threat that climate change poses. And that's why President Obama has worked so hard to reduce our own emissions and to lead internationally in forging the Paris climate agreement.

Progress is the product of human agency. Things get better because we make them better. Things go wrong when we get too comfortable, when we fail to take risks or seize opportunities.

President Obama is an extraordinary person to work with and for.