I am straight forward; I am not manipulative; I am not two-faced. And I think that that has served me well in all of my roles, particularly as a diplomat, because people knew if I said something, I meant it. If I said no, I meant no, and if I said we could make this work, we would make it work.

President Obama is perhaps the smartest person I've ever worked with.

I am straight forward; I am not manipulative; I am not two-faced. And I think that that has served me well in all of my roles, particularly as a diplomat, because people knew if I said something, I meant it. If I said no, I meant no, and if I said we could make this work, we would make it work.

What I would say about me is: What you see is what I get.

If you're trying to get something done, there will always be people who don't want to see you get something done, or who have a stake in the status quo. And if they approach that through ad hominem criticism of you, you've got to have enough confidence and thickness of skin to be able to endure.

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.

Americans understand that our security is enhanced when the United States is trusted and respected in the world.