Tesla remains Musk’s best-known business, but its fortunes are less directly tied to the government than SpaceX, his rocket-building company.

The feud between Elon Musk and President Donald Trump heated up again Tuesday after the billionaire slammed Republicans over the president's spending bill.

"We might have to put DOGE on Elon," Trump told reporters on Tuesday morning, referring to the Department of Government Efficiency, which Musk spearheaded at the White House until May, tasked with cutting fraud and waste in federal spending.