Thom Tillis, Republican Senator, Won’t Seek Re-election Amid Trump’s Primary Threats

Politics|Tillis Announces He Won’t Run Again as Trump Threatens Him With a Primary

Senator Thom Tillis, Republican of North Carolina, announced on Sunday that he would not seek re-election next year, a day after President Trump threatened to back a primary challenger against him because Mr. Tillis had said he was opposed to the bill carrying Mr. Trump’s domestic agenda.

Mr. Tillis’s departure will set off a highly competitive race in North Carolina that could be pivotal in the battle for control of the closely divided Senate. It was the latest congressional retirement to underscore the rightward shift of the G.O.P. and the reality that there is little room for any Republican to break with Mr. Trump.

“In Washington over the last few years, it’s become increasingly evident that leaders who are willing to embrace bipartisanship, compromise, and demonstrate independent thinking are becoming an endangered species,” Mr. Tillis said in a lengthy statement on his decision.

The announcement came as the Senate was wading into a debate over the large-scale tax cut and domestic policy bill that Mr. Trump has demanded be delivered to his desk by July 4. Mr. Tillis announced his decision the day after issuing a statement saying he could not in good conscience support the measure, which he said would lead to tens of billions of dollars in lost funding for his state, costing people Medicaid coverage and critical health services.

He was among just two Republicans who voted Saturday night against bringing up the bill.

Mr. Tillis has been privately critical of the legislation and trying to warn his colleagues of the political downsides for them if they back it. In a closed-door meeting with his Republican colleagues last week, he warned that the sweeping legislation could be a political albatross for the party in 2026.

The president’s allies celebrated Mr. Tillis’ announcement as more proof of Mr. Trump’s political strength. “Don’t Cross Trump,” Jason Miller, who served as a top adviser for the president’s re-election campaign, wrote on social media. “The voters gave him a mandate to implement a specific agenda, and they want everyone to get behind his efforts!”