Donald Trump: “If you don’t respond, we assume you’re not around, and you’re not getting paid anymore, too.”

We are talking to Iran. We have been.

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.

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