I have been to Libya and walked the streets of Benghazi myself.

Well, Nigeria has played a constructive role in peacekeeping in various parts of West Africa. But unless and until Nigeria itself is democratic and respects human rights, it too may well be a source of much greater instability as political repression limits the ability of the people of Nigeria to achieve their full potential.

What we have done is when the threat has been directed at the United States, i.e., the terrorist threat from ISIL or Al-Qaeda in Syria, is to go after them.

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

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.

We're well aware, and we have been for a long time, that there is a real threat from adversaries, state actors, non-state actors, to hack us, influence us, destroy stuff through cyber means. Because cyber threat has been understood for a while, it's longstanding, it's a concern.

I like to think that with me, what you see is what you get, and you can like or dislike it, it's up to you, but it's straight. That's something that I pride myself on.