Tech billionaire and Tesla CEO Elon Musk on Tuesday slammed the US tax cuts and spending mega-bill that President Donald Trump is trying to push through Congress as a "disgusting abomination."

"I'm sorry, but I just can't stand it anymore," Musk posted on X, days after ending his tenure as one of the Republicans' closest advisors.

"This massive, outrageous, pork-filled Congressional spending bill is a disgusting abomination. Shame on those who voted for it: you know you did wrong. You know it," he said.

Following his criticism, the White House defended Trump's huge tax cuts and spending mega-bill.

"The president already knows where Elon Musk stood on this bill, it doesn't change his opinion. This is one big, beautiful bill, and he's sticking to it," Press Secretary Karoline Leavitt told reporters.

Elon Musk, who stepped down as the chief of the Department of Government Efficiency (DOGE), meant to save "trillions" of American taxpayer dollars, was last week given a ceremonial farewell at the White House.

He had expressed his 'disappointment' earlier too and described it as a “massive spending bill” that increases the federal deficit and “undermines the work” of the DOGE.

"I was disappointed to see the massive spending bill, frankly, which increases the budget deficit, not just decreases it, and undermines the work that the DOGE team is doing," Musk had said in an interview with CBS.

“I think a bill can be big or it could be beautiful. But I don’t know if it could be both,” he had said.

The bill, known as "One Big Beautiful Bill Act,"  is aimed at fulfilling Trump's vision for a new "Golden Age", led by efforts to shrink social safety net programmes to pay for a 10-year extension of his 2017 tax cuts.

The legislation also seeks to ramp up spending on border security, enforce Medicaid work requirements, and roll back clean energy tax credits.

The bill was passed by the House of Representatives last week and will now move to the Senate.