Russia committed an act of aggression in Ukraine, and that's the first time since 1945 a European country has seized the territory of another European country. That's serious business. They started a war with their neighbor. Their troops as well as the separatists funded and controlled by Russia are killing people just about every day.

The Civil War was fought, in a sense, over whether that sentence - all men are created equal - is to be taken literally. And the southerners in the 1850s argued that it was not.

The American tradition of foreign policy exceptionalism, our grand strategy as a nation, reaches back much further. Really at the turn - the end of the 19th century, when we achieved power a generation after the Civil War, the outlines of an American vision came into focus, and what we - it was based on two things. One, our realization that our values and our interests were the same, and that our business interests would advance as our values advanced in the world.

[Donald Trump administration] didn`t ask me to stay and 40 years seemed like enough.

America is not an ethnostate. We are not rooted in blood and soil.

We are a new nation conceived in liberty, and dedicated to the proposition that all men are created equal. That's what makes us Americans. When we sign onto that belief, we sign onto the core American identity, and that's very deep in us.

I think that President George W. Bush was ahead of most of his government, in realizing that Putin was not the person we thought he was.