Shares of Tesla tumbled 7% Monday as the feud between CEO Elon Musk and Trump reignited over the weekend. Musk, once a top donor and ally of Trump, announced that he was forming a third political party in protest over the Republican spending bill that passed late last week.

Dan Ives, an analyst with Wedbush, wrote that Musk's continued push into politics is "exactly the opposite direction" investors want to see.

Mr. Musk’s involvement in politics and his financial support for the president’s campaign was once seen by investors as a benefit to Tesla, fueling a steep rise in company shares after the election last year. That association has now turned into a liability. Tesla shares are down 40 percent from their peak in December.