WASHINGTON D.C. — In a surprising move that could shake up President Trump’s ambitious legislative agenda, Republican Congressman Thomas Massie has announced that he believes he has secured enough votes to block the so-called “One Big Beautiful Bill” (OBBB) in the House of Representatives.

Massie, a well-known libertarian-leaning Republican from Kentucky, revealed on Monday that he has rallied a group of at least ten Republican lawmakers ready to vote against the massive spending and tax overhaul package championed by Trump. His statement comes just days after the bill narrowly cleared the Senate with Vice President J.D. Vance casting the tie-breaking vote.

The “One Big Beautiful Bill” has been touted by Trump as a landmark piece of legislation that would slash taxes further, boost defense and border funding, and roll back a number of federal social programs. The bill’s estimated cost is projected at over $4.5 trillion over the next decade — a number that has alarmed fiscal conservatives like Massie.

In an interview outside the Capitol, Massie declared, “I cannot, in good conscience, vote for a bill that adds trillions more to our national debt. And I’m not alone. I have spoken with enough of my colleagues who share my concerns. If leadership thinks they have the votes, they’re in for a surprise.”

Massie has long been a thorn in the side of House Republican leadership when it comes to federal spending. He famously held up COVID relief votes in 2020 and has often clashed with his own party over debt ceiling increases and omnibus packages.

Trump, meanwhile, has made passing this bill a cornerstone of his second-term agenda. He has called it “the biggest, most beautiful tax cut and border protection bill ever seen.” The legislation combines sweeping tax cuts for individuals and corporations with increased funding for the southern border wall extension, military expansion, and new work requirements for welfare programs.

While the White House and GOP leadership have been confident they could keep the Republican caucus unified, Massie’s announcement throws that plan into chaos. With Republicans holding only a razor-thin majority in the House — currently 218–217 — losing even a handful of votes could tank the bill.

In a late-night Truth Social post, Trump lashed out at Massie, calling him “a grandstanding fake conservative who doesn’t understand winning.” The former president urged his allies to pressure any defectors, warning that anyone who blocks the bill would be “remembered as a traitor to the MAGA movement.”

Despite the threats, Massie appears unmoved. He insists he is standing up for taxpayers and future generations who will bear the cost of what he calls “reckless, unfunded promises.” He has also received backing from other fiscal hawks like Representatives Chip Roy of Texas and Ken Buck of Colorado, who have also signaled skepticism about the bill’s price tag.

Political analysts say Massie’s move could force House Speaker Mike Johnson into frantic negotiations to tweak the bill or offer concessions to the rebellious faction. Some House Democrats have ruled out helping Republicans pass the measure, calling it “an irresponsible giveaway to billionaires and defense contractors.”

Meanwhile, Senate Republicans are watching nervously, aware that any changes in the House would mean the bill has to go back through the Senate — where its passage was already razor-thin.

For now, the fate of Trump’s “One Big Beautiful Bill” hangs in the balance. Massie and his small but determined bloc of conservatives may have just ignited one of the biggest intraparty showdowns of the year — a test of whether Trump can still bend every corner of the Republican Party to his will, or if fiscal hawks can still draw a line in the sand.

“This is about principle, not personality,” Massie said as he left the Capitol steps. “No matter who sits in the White House, someone has to say ‘Enough is enough.’”

If he follows through, that “someone” might just derail Trump’s biggest legislative prize yet.