Elon Musk's Department of Government Efficiency (Doge) - set up to cut US government spending - claims to have saved, on average, more than $10bn a week since President Trump entered office. "We're talking about almost $200bn and rising fast," Trump told the BBC when talking about Mr Musk's cost-cutting drive on 23 April.

Elon Musk said he would keep doing part-time work for the Trump administration beyond next month, raising more questions about his role and whether the White House is following the rules.

The billionaire head of the U.S. DOGE Service clashed with Trump Cabinet officials well before he announced he would soon head back to Tesla.