WASHINGTON — President-elect Donald Trump delivered a probable death blow to bipartisan congressional budget negotiations on Wednesday, rejecting the measure as full of giveaways to Democrats and increasing the risk of a government shutdown right before Christmas.

“Republicans must GET SMART and TOUGH. If Democrats threaten to shut down the government unless we give them everything they want, then CALL THEIR BLUFF,” Trump said in a joint statement with JD Vance, the vice president-elect.

It was a display of dominance from a president-elect still a month away from inauguration who remains hundreds of miles away at his Mar-a-Lago resort in Florida. It reinjected a sense of chaos and political brinkmanship that was reminiscent of his first term in office.

The episode also showcased the influence of Elon Musk and Vivek Ramaswamy, who spent the day attacking the budget legislation as full of excessive spending. They kicked up a storm on social media — Musk even threatened to support primary challenges against anyone who voted for the measure — before Trump decided to weigh in himself.

“Kill the Bill!” Musk wrote on his social media platform X as he gleefully reposted messages from Republican House members who vowed not to back the bill.

Trump’s allies were overjoyed by his intervention, viewing it as the fulfillment of his promise to shake up Washington. But lawmakers were also left bewildered by how a crucial bipartisan deal could fall apart so quickly just days before the deadline. There are also questions about the future of Trump-backed House Speaker Mike Johnson, who was pushing the budget legislation and is up for reelection for his post in just a couple of weeks.