Elon Musk's whirlwind stint in the Trump administration has ended with a dramatic twist, as the tech mogul lashes out at the president's prized legislation.

"Shame on those who voted for it: you know you did wrong," the Tesla CEO wrote, citing projections that the legislation would add more than $2 trillion to the national debt.

Elon Musk criticises Trump’s multi-trillion dollar tax and spending bill as a “disgusting abomination,” warning of rising debt and political fallout, signalling a major rift between the two allies.