"I’m sorry, but I just can’t stand it anymore," the billionaire Musk wrote in an X post. "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."
The broadside comes as Trump pressures Republicans in the Senate to approve the legislation he dubbed the "big, beautiful bill," which has been passed in the House of Representatives.
Trump appointed Musk, the world's richest person, to lead a government cost-cutting and efficiency drive, during which he upended several federal agencies but ultimately failed to deliver the massive savings he had sought.
Musk left his formal role in the administration last week as his time as a special government employee with the Department of Government Efficiency came to an end.
(Reporting by Doina Chiacu; Editing by Scott Malone)

US President Donald Trump and Elon Musk in Washington, DC, US, 19 January 2025. (Photo: EPA-EFE / WILL OLIVER)