Electric vehicles are expected to take a hit under the existing reconciliation budget proposal, but that isn’t the only provision that would seemingly hurt Elon Musk and his business if passed as written.

Musk attacked Trump directly over his signature spending bill for the first time Thursday, sparking an explosive back-and-forth.

The stock has been on a roller coaster ever since Mr. Trump’s election. The shares are down about 13 percent this week.