For the United States to recommit itself to the obligation that we undertook in the Nuclear Non-Proliferation Treaty that many other states undertook, which was to work towards disarmament and the eventual elimination of nuclear weapons, is something that manifestly serves our national security interests.

I was conscious of the fact that it could be to my disadvantage to marry a white guy - that some folks would hold that against me.

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

I think people have confidence that I will fairly and accurately represent their point of view to the President, and that I'm not going to put a spin on it, even if I may disagree with it.

I don't worry about how folks want to characterize me.

Focus on something that stirs your soul, it's hard to excel at anything that you don't love.

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.