Elon Musk has long railed against the U.S. government, saying a crushing number of federal investigations and safety programs have stymied Tesla, his electric car company, and its efforts to create self-driving automobiles.

Musk, who also runs SpaceX and a number of other companies, has been known to make big often exaggerated promises. For example, he once called the Hyperloop, which was never built, the "fifth mode of transport" and famously promised to take Tesla private in a Twitter post, saying he had secured financing that he didn't have.

Elon Musk has long railed against the U.S. government, saying numerous investigations and safety programs have stymied Tesla, his electric car company, and its efforts to create fleets of robotaxis an