WASHINGTON (Reuters) -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.

Trump fired back on his own social media site, Truth Social, that the “easiest way to save money” would be to “terminate Elon’s Governmental Subsidies and Contracts.” Back on X, Musk said: “Go ahead, make my day.”