We can build a new modern electric grid. That's a lot of jobs; that's a lot of new economic activity.

Every presidential candidate for decades has released his tax returns, and I've released 33 years of my tax returns. The American people deserve to know about our taxes. And so Donald Trump is standing in the way of precedent that goes back on both sides of aisle Democrats and Republicans, and he clearly has something that he doesn't want us to see.

This is a moment in history where it is almost hard to catch your breath.

The United States strongly condemns the illegal disclosure of classified information. It puts people's lives in danger, threatens our national security, and undermines our efforts to work with other countries to solve shared problems.

Donald Trump poses a serious threat to America, based on what he has said. He is unqualified to be president and he is unfit temperamentally to be commander-in-chief.

It plays right into the hands of ISIS. And that's why Americans need to know that Donald Trump's words are being used in recruitment videos that ISIS is putting out. I think that is a very serious problem.

What Donald Trump has done is to make it possible for people who had racist, sexist, and all kinds of prejudices and bigotry to put them right out there.