Donald Trump: “I’ve been watching this man for years now... He has no cards, and you get sick of it.”

We are talking to Iran. We have been.

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

I would rather not destroy the rest of the country if possible, but maybe I will have to. You'll know soon enough.

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