Donald Trump: “A moderately successful comedian.”

Our calling is to explore. Our purpose is to build, and our aim is always to win.

Stephen's been with me from the beginning. He gets it, very good politically ... and he's a very good manager. He'll do a great job.

Just this week, I issued the American Declaration of Freedom in Space, proclaiming all of space opened for American settlement, American civilization and American freedom.

Within the next two years, NASA will launch the first-ever nuclear-powered spacecraft to Mars.