I'm one of these very focused people when it comes to day-to-day work, and I'm trying not to think about what comes next so that I can stay very focused on what I'm doing now.

When I talk about how we're going to pay for education, how we're going to invest in infrastructure, how we're going to get the cost of prescription drugs down, and a lot of the other issues that people talk to me about all the time, I've made it very clear we are going where the money is. We are going to ask the wealthy and corporations to pay their fair share.

I think for a lot of young people there is a sense that maybe the future is not going to be everything it was held out to be, especially if they're coming out with a lot of student debt.

I think what the president [Barack Obama] understands, and what he's trying to do, is that we have to support the Arab and Kurdish fighters on the ground who are actually doing the fighting.

I do not add a penny to the national debt.

We didn't put a single boot on the ground, and [Muammar] Gaddafi was deposed. The Libyans turned out for one of the most successful, fairest elections that any Arab country has had. They elected moderate leaders.

We'll keep guessing at what it might be that he's hiding. But I think the question is, were Donald Trump ever to get near the White House, what would be those conflicts?