For months, Tesla shareholders were tormented by Elon Musk’s role in the administration of President Donald Trump. But any relief brought by his formal government exit last week quickly turned to fear as the electric-vehicle maker’s chief executive traded barbs with his former boss.

As Elon Musk and Donald Trump take jabs at each other online, their respective businesses are plummeting in value.

Just like Tesla, Trump Media’s shares fell sharply on Thursday afternoon as Musk publicly sparred with the president and backed calls for his impeachment.