Elon Musk’s four-month blitz through the US government briefly made him Washington’s most powerful businessman since the Gilded Age. But it has done little for his reputation or that of his companies.

Musk this week formally abandoned his role as the head of the so-called Department of Government Efficiency (Doge), which has failed to find even a fraction of the $2 trillion in savings he originally pledged.

On Thursday, Donald Trump lamented his departure but said Musk “will always be with us, helping all the way.”

Yet the billionaire will be left calculating the cost of his involvement with Trump and the meagre return on his $250 million investment in the US president’s election campaign.

“I appreciate the fact that Mr Musk put what was good for the country ahead of what was good for

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