The science [of global warming] is beyond dispute... Delay is no longer an option. Denial is no longer an acceptable response

Moammar Gadhafi had more American blood on his hands than any individual other than Osama bin Laden.

I have the authority to address the threat from Isil, but I believe we are strongest as a nation when the president and Congress work together. So I welcome congressional support for this effort in order to show the world that Americans are united in confronting this danger.

It is that fundamental belief, it is that fundamental belief, I am my brother’s keeper, I am my sister’s keeper that makes this country work. It’s what allows us to pursue our individual dreams and yet still come together as one American family. E pluribus unum. Out of many, one.

Donald Trump is temperamentally unfit.

What is certainly true is that the United States has to have a presence to promote the values that we care about.

I think that [having not a lot of time sweating the details] can be both a strength and a weakness. I think it depends on how [Donald Trump] approaches it. If it gives him fresh eyes, then that can be valuable. But it also requires you knowing what you don't know and putting in place people who do have the kinds of experience and background and knowledge that can inform good decision making.