The U.S. constitution is an extraordinary document. In my view, it should not be amended often.

The middle class is collapsing and we are moving toward an oligarchic form of society, where the billionaires will control the economy and the political life of the country.

The United States must lead the world in reversing climate change. We can do that.

Please don't suggest that I think we normalize relations with Tehran tomorrow. We don't. But I would like to see us move forward, and hopefully some day that will happen.

So what I have said with regard to Boeing and GE and other multinationals that pay zero taxes, you know what we're going to do? We're going to end that loophole. They are going to pay their fair share of taxes.

If you`re a Republican politician and you`re seeing this guy [Donald Trump] saying crazy stuff and going up in the polls, what are you going to say, you`re going to say equally crazy or maybe a little less crazy stuff.

I think the immediate thing is we stand up to protect those people who are in trouble.