Tesla shares plunged 14%, marking one of the steepest declines in months as Musk and Trump battled online.

Musk has called to “kill” Trump’s policy bill, criticizing the legislation as “massive, outrageous” and “pork-filled.”

The breakup between the president of the United States and the world’s richest man is unfurling much like their relationship started — rapidly, intensely and very publicly. As…