We've admitted 59 million immigrants to the United States between 1965 and 2015. Many of these arrivals have greatly enriched our country. So true. But we now have an obligation to them and to their children to control future immigration as we are following, if you think, previous immigration waves.

I walked into the main entrance of the White House, and I said to myself, "This is sort of amazing."

One of the problems when you become successful is that jealousy and envy inevitably follow. There are people - I categorize them as life's losers - who get their sense of accomplishment and achievement from trying to stop others. As far as I'm concerned, if they had any real ability, they wouldn't be fighting me, they'd be doing something constructive themselves.

I've taken people and fired them over a period of a year. I've fired them over a period of a month. I've fired them over a period of a day or a week, nice and easy, slow. The one thing that a firing always has in common is the next day they wake up and they hate Donald Trump, no matter how nice you are.

I really think I am a nice person. [But] this is not going to be an election on niceness. This is going to be an election on competence.

Mitt Romney was treated very unfairly. Mitt Romney didn't want to give his tax returns, because people don't understand returns that are complicated, and complex. And he didn't give it. He fought it, fought it, fought it, all the way into September. A month before the election, he gave his tax returns. And they picked out two items that were absolutely perfect. He did nothing wrong. And his returns are very much smaller than my returns.

I always say, keep the oil. I said don't go in, but I said keep the oil.