No two countries are identical, and obviously, there's a difference between a referendum on a very complex relationship between Great Britain and the rest of Europe, and a presidential election in the United States.

If it is orderly and lawful, immigration is good for our economy.

The Democrats are as concerned about raising our kids and making sure that the values of empathy and hard work and discipline and self-respect are instilled in our children, and I've got a six-year-old daughter and a three-year-old daughter, and I'm not afraid to talk about how I want to provide them with the sort of cultural framework that's going to allow them to be successful, happy people.

We want our children to live in an America that isn't burdened by debt, that isn't weakened by inequality, that isn't threatened by the destructive power of a warming planet.

In Iraq and Syria, American leadership - including our military power - is stopping ISIL's advance, instead of getting dragged into another ground war in the Middle East, we are leading a broad coalition, including Arab nations, to degrade and ultimately destroy this terrorist group.

I hope we can all agree that, instead of continuing to subsidize yesterday's energy sources. We need to invest in tomorrow's.

Donald Trump is somebody who I think likes to mix it up and to have a vigorous debate.