Elon Musk on Tuesday hammered US President Donald Trump's proposed spending bill as a "disgusting abomination" as tensions between the pair burst into the open following the tech billionaire's White House exit.

Musk left his role as an official government employee last week, lauded by Trump for spearheading a federal spending cuts program, but disagreements between the duo have been building.

"This massive, outrageous, pork-filled Congressional spending bill is a disgusting abomination," Musk posted on X, in by far his most caustic remarks on Trump's spending plans.

"Shame on those who voted for it: you know you did wrong."

It was not Musk's first comments on Trump's so-called "big, beautiful bill" which is set to add $3 million to US deficits over a 10-year horizon, despite deep cuts

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