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

I think it's time we had a President who will provide the only real economic security: good jobs. A President who will provide middle class payroll tax relief to get money in the pockets of workers who will spend it, not more tax giveaways for those at the top to stimulate the economy in the Cayman Islands and Bermuda. A President who will index the minimum wage to inflation and raise it from a 30 year low, not increase the tax burden on the middle class and those struggling to join it.

I can't take my Catholic belief, my article of faith, and legislate it on a Protestant or a Jew or an Atheist. We have separation of church and state in the United States of America.

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

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.

We achieved a deal with the Russians that didn't wind up in two days of strikes that would have sent a, quote, "message," but would not have removed the weapons. We struck a deal to get all of the declared weapons out of Syria. Never before in a conflict has that ever happened, that during the conflict weapons of mass destruction are taken out of the zone of conflict. And thank God we did that, because if we hadn't done that, today ISIL would have those chemical weapons in large parts of the country.

I came into public life during the 1960s when a whole bunch of us believed in our ability to change the world. And we did a lot of things.