John Kerry: “It is a guarantee that if the United States does not act together with other countries, we know what Assad will do.”

It's a matter of mathematics and physics, not politics, not ideology. It is a response to the science.

I have to admit to you, if anybody thinks it is radical to care about the protection of this planet for future generations, sign me up.

The era of the Monroe Doctrine is over.

I mean, we try to help the world.