Sales at Elon Musk’s Tesla have fallen to a three-year low amid the billionaire’s public spat with Donald Trump. The electric carmaker said customer deliveries fell by 13.5pc in the second quarter of the year, a period in which Mr Musk left his role in the White House and publicly fell out with the US president over his tax and spending bill.

The feud reignited on Monday when Musk, who spent hundreds of millions on Trump's re-election, renewed his criticism of Trump's tax-cut and spending bill, which would eliminate subsidies for electric vehicle purchases that have benefited Tesla, the leading U.S. EV maker. That bill passed the Senate by a narrow margin midday Tuesday.