Tesla¡¯s shares sank as a simmering feud between company chief Elon Musk and U.S. President Donald Trump devolved into a public war of words between two of the world¡¯s most powerful people.

Trump on Thursday said he was ¡°very disappointed¡± by the Tesla chief executive officer¡¯s criticism of his signature tax policy bill. Musk fired back in several social media posts, saying in one that ¡°without me, Trump would have lost the election.¡±

The U.S. president later floated terminating federal contracts and subsidies extended to Musk¡¯s companies and said that he had asked the Tesla and SpaceX leader to leave his administration, which Musk said was a ¡°lie.¡±