I can tell you is all nine of the people here [on debates] would make an infinitely better commander in chief than Barack Obama or Hillary Clinton.

You have to be willing to have the decision-making follow the data.

President [Barack] Obama has talked about fundamentally transforming this country. There's 7 billion people across the face of the globe, many of whom want to come to this country. If they come legally, great. But if they come illegally and they get amnesty, that is how we fundamentally change this country, and it really is striking.

I don't know that I'm in a position to give campaign advice to Donald Trump, given that he just whipped me in a primary.

If you look on the Republican side, the two Republicans who have most energized young people in modern times are Ronald Reagan and Ron Paul.

This country is always changing. But my point about the Supreme Court is the Supreme Court didn't wait for the country to change. Five unelected lawyers overruled 320 million Americans.

I don`t get angry often, but you mess with my wife, you mess with my kids, that will do it every time. Donald Trump, you`re a snivelling coward and leave Heidi the hell alone.