I don't think any sensible person would disagree that the invasion of Iraq led to the massive level of instability that we're seeing right now. I think that was one of the worst foreign policy blunders in the modern history of the United States.

Today, the United States is No. 1 in corporate profits, No. 1 in CEO salaries, No. 1 in childhood poverty and No. 1 in income and wealth inequality in the industrialized world.

The truth is we have a political system and an economic system controlled by a few extremely wealthy people. Not Barack Obama, not Bernie Sanders, no one person has the influence by himself or herself to take on this enormous array of power unless millions of people begin to work together to demand changes.

Our job is to provide coalition the military equipment that they need; the air support they need; special forces when appropriate. But at the end of the day for a dozen different reasons, not the least of which is that ISIS would like American combat troops on the ground so they could reach out to the Muslim world and say, "Look, we're taking on those terrible Americans."

People are hurting and angry, and they want something to be able to stand up and fight for. That's what I believe the antidote is to Trumpism.

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

For Democrats to win, they're going to have to address the needs of working people. They're going to have to address the needs of the middle class. And that means standing up to Wall Street, standing up to the greed of corporate America. Even now and then, standing up to the media. And that means having a candidate who can excite working families, excite young people, bring them into the political process, create a large voter turnout.