The inquiry comes as the once-close relationship between the president and the tech billionaire has deteriorated into a highly public feud.

Space science experts told ABC News SpaceX has been essential to NASA’s missions and the breakdown of a relationship would leave a hole that would be hard to fill.

Donald Trump appeared to dismiss the idea of a phone call with Elon Musk this morning after their feud exploded in ...

The U.S. government relies on SpaceX to support NASA and other agencies, and the company has received more than $20 billion ...

Besides its flights to the International Space Station and Starship program, SpaceX is deeply embedded in the Department of ...

Elon Musk's threat, which he later retracted, to cut off NASA's use of SpaceX's Dragon spacecraft would be a huge blow to NASA, depriving the space agency of the only American vehicle capable of ...