These guys [Republicans] are the most crooked, you know, lying group I've ever seen.

I had a chance to talk with President [Vladimir] Putin and he clearly said to me very directly, "I will think about that. I will think about this challenge of how we win." Look, this is not easy for Putin. Everybody says, "Oh, Putin's made a big move." Well, Putin is [in Syria] now; and if he wants to fight ISIL alone, that's a challenge, folks.

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

Those who deny the science or choose excuses over action are playing with fire.

Think about this: terrorism, epidemics, poverty, the proliferation of weapons of mass destruction-all challenges that know no borders-the reality is that climate change ranks right up there with every single one of them.

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

If the tea party folks would go out there and get angry because they think their taxes are too high, for God's sake, a lot of citizens ought to get angry about the fact that they're being killed and our planet's being injured by what's happening on a daily basis by the way we provide our power and our fuel and the old practices that we have. That's something worth getting angry about.