Donald Trump: “If people don't respond, it's very possible that there is no such person or they're not working.”

We're going to be paving the way for astronauts to plant the Stars and Stripes on the red planet.

They knocked out – they built a little bit of an anti-aircraft device and we knocked it out in about 15 minutes, maybe five.

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.

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