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.

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.

Financial writer warns against buying Tesla, Inc. stock, citing declining fundamentals and unrealistic promises from CEO Elon Musk. Click for this TSLA update.