Tech billionaire Elon Musk has launched a fiery public offensive against President Donald J. Trump’s newly proposed tax-cut package, issuing dire warnings about the bill’s impact on the national debt and urging lawmakers to torpedo the legislation.

“Call your Senator, Call your Congressman,” Musk posted to his platform X (formerly Twitter). “Bankrupting America is NOT ok!”

The Tesla and SpaceX founder didn’t hold back, referring to what Trump has proudly dubbed his “big, beautiful bill” as a “disgusting abomination,” and demanded Congress “KILL the BILL.” Musk argued that the current proposal, which would increase the debt ceiling by $5 trillion, constitutes a betrayal of fiscal responsibility.

Musk’s latest posts mark a stunning escalation in his opposition to the bill. Over the past 48 hours, he has made or reshared more than two dozen posts criticizing the legislation and its broader implications for America’s financial future.

His remarks come just days after stepping down from his brief but high-profile stint in the Trump administration. Musk had led the Department of Government Efficiency (DOGE), a temporary advisory role created to identify and eliminate bureaucratic bloat in Washington.

Sources inside the White House, speaking anonymously to CNBC, admitted they were surprised by Musk’s aggressive tone. Though President Trump has yet to respond publicly, insiders say he is “disappointed” by the attack from an ally once hailed as a bold reformer in the administration’s war against big government.

Still, there has been no direct communication between the President and Musk over the matter, according to officials familiar with the situation.

NBC News reported that Musk’s outspoken opposition may be partially driven by the bill’s proposed rollback of electric vehicle tax credits, which directly impact Tesla. Additionally, two other sticking points reportedly contributed to the rift: the White House's refusal to let Musk’s Starlink network handle FAA operations, and the withdrawal of Musk’s preferred nominee to lead NASA.

Musk had also expressed interest in remaining in his government role beyond the 130-day legal limit for temporary employees, but the administration reportedly turned down the request.

Despite the clash, President Trump did offer a warm sendoff to Musk last week during a White House ceremony. And on Wednesday, Trump’s Truth Social account reposted Musk’s earlier message of gratitude for the opportunity to lead DOGE.

As Musk launched his broadside, Trump’s allies were quick to defend the tax bill. Russ Vought, head of the Office of Management and Budget and a trusted figure from Trump’s first term, pushed back hard against critics.

“OMB just reviewed the new CBO score of the One Big Beautiful bill,” Vought wrote on X. “It confirms what we knew about the bill at House passage. The bill REDUCES deficits by $1.4 trillion over ten years… It includes $1.7 trillion in mandatory savings, the most in history. If you care about deficits and debt, this bill dramatically improves the fiscal picture.”

Still, public skepticism lingers. “Reducing deficits sounds great until you read the fine print. When’s the last time CBO got it right?” one user wrote in reply.

While the administration remains committed to advancing its bold pro-growth agenda, the brewing feud with Musk underscores a growing tension within the ranks of those who once championed small government and fiscal restraint.