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.

Shares of electronic-vehicle maker Tesla fell more than those of GM and Ford, despite less exposure to impacts from potential tariffs on Canada and Mexico.

Elon Musk had a lot to say about Tesla’s upcoming Robotaxi service on Wednesday. Robotaxi will be coming to Austin and other cities later this year, Musk claims.