The worried reaction within space and national security agencies highlights the risks of government’s exclusive dependence on SpaceX for crucial tasks, including classified missions.

As President Donald Trump and Elon Musk argued on social media on Thursday, the world's richest man threatened to decommission a space capsule used to take astronauts and supplies to the International Space Station.

Elon Musk says that he's cutting off NASA's access to space, in a potentially devastating blow to the United States' space program.