Donald Trump threatened on Thursday to cut off government contracts to Elon Musk's companies and the world's richest man suggested the U.S. president should be impeached, marking a stark end to an unlikely alliance and leaving onlookers wondering what was next.

President Trump said his relationship with Elon Musk might be over after Musk spent the past few days trying to defeat Trump's "big, beautiful bill."

Shares of Elon Musk’s electric vehicle maker are falling sharply Thursday as investors fear his dispute with Donald Trump could end up hurting the company