I will never cede the authority of our country or our security to any other nation. I'll never give a veto over American security to any other entity - not a nation, not a country, not an institution.

I think that all of the cyber attacks that are taking place, but particularly this - the Russian one, had a profound impact on the American system, on our political process, on our - it invaded the space of our election. The releasing on a regular basis of one party's stolen emails had an impact, and I think that other things also had an impact.

American can do better, and help is on the way.

America that has done more to support Israel than any other country cannot be true to our own values if we allow a viable two-state solution to be destroyed before our own eyes.

America now stands as the world's foremost power. We should be proud: Not since the age of the Romans have one people achieved such preeminence. But we are not Romans; we do not seek an empire. We are Americans, trustees of a vision and a heritage that commit us to the values of democracy and the universal cause of human rights.

[Bashar] Assad has made a series of choices ever since then that is literally destroying his country.

I’ve often said that global climate change is an issue where no one has the luxury of being “half-pregnant.” You either are or you aren’t. And so it is with climate change. You either understand and accept the science – or you don’t. Folks this isn’t a cafeteria where you can pick and choose and accept the science that tells us what is happening, but then reject the science that warns us what will happen.