WASHINGTON – Republican Sen. Thom Tillis of North Carolina announced on Sunday that he will not be running for reelection next year. This sudden decision follows his recent opposition to President Donald Trump’s package of tax cuts and spending reductions due to its impact on health care programs.

This development opens up a significant political opportunity for Democrats aiming to increase their representation in the 2026 midterm elections, as it leaves a competitive Senate seat in a key battleground state. It might also position Tillis as a wildcard in the Republican Party, where many are hesitant to go against Trump’s policies. Previously, Trump had already hinted at a primary challenge against him and expressed approval of Tillis’ announcement by stating it was “Great News!”

“In recent years, it’s become more apparent in Washington that leaders willing to work across party lines, find compromise, and showcase independent thought are becoming rare,” Tillis explained in a detailed statement.

Tillis said he was proud of his career in public service but acknowledged the difficult political environment for those who buck their party and go it alone.

“I look forward to having the pure freedom to call the balls and strikes as I see fit and representing the great people of North Carolina to the best of my ability,” Tillis said in a statement.

Republicans hold a 53-47 edge in the Senate.

Trump, in social posts, had berated Tillis for being one of two Republican senators who voted on Saturday night against advancing the massive tax bill.

The Republican president accused Tillis of seeking publicity with his “no” vote and threatened to campaign against him, accusing the senator of doing nothing to help his constituents after last year’s devastating floods in western North Carolina from Hurricane Helene.

“Tillis is a talker and complainer, NOT A DOER,” Trump wrote.

The announcement from the two-term senator surprised senior Republicans with its timing, but not necessarily the substance. Tillis had planned to announce his reelection plans later this year, likely September at the latest, but had been heavily leaning in favor of retiring, according to a person close to the senator.

In the hours before his announcement, Tillis was weighing two questions: whether Trump and the White House would give him freedom to campaign with some independence, and whether Tillis would have the full protection of Senate Republican leaders, said the person, who was granted anonymity to discuss internal dynamics.

The GOP leadership’s decision to forge ahead with cuts to Medicaid that Tillis repeatedly warned would devastate North Carolina, and the president’s Truth Social post calling for a primary challenger to the senator made it clear to him that the answers to those two questions were no.

Tillis then decided he would announce his retirement, with the thinking that it would remove any ambiguity whether he would flip his opposition to the GOP’s sweeping tax bill.

The North Carolina Republican Party chairman, Jason Simmons, said the party wishes Tillis well and “will hold this seat for Republicans in 2026.” Sen. Tim Scott of South Carolina, the chairman of the campaign arm for Senate Republicans, did not mention Tillis in a statement but said the party’s winning streak in North Carolina will continue. Scott noted that Trump won the state three times.

Democrats expressed confidence about their prospects.

Former Rep. Wiley Nickel, who announced his candidacy in April, said he was ready for any Republican challenger.

“I’ve flipped a tough seat before and we’re going to do it again,” Nickel said in a statement.

Some said Tillis’ decision is another sign of the dramatic transformation of the Republican Party under Trump, with few lawmakers critical of the president or his agenda remaining in office.

It “proves there is no space within the Republican Party to dissent over taking health care away from 11.8 million people,” said Lauren French, spokesperson for the Senate Majority PAC, a political committee aligned with the chamber’s Democratic members.

Tillis rose to prominence in North Carolina when, as a second-term state House member, he quit his IBM consultant job and led the GOP’s recruitment and fundraising efforts in the chamber for the 2010 elections. Republicans won majorities in the House and Senate for the first time in 140 years.

Tillis was later elected as state House speaker and helped enact conservative policies on taxes, gun rights, regulations and abortion while serving in the role for four years. He also helped push a state constitutional referendum to ban gay marriage, which was approved by voters in 2012 but was ultimately struck down by the courts as unconstitutional.

In 2014, Tillis helped flip control of the U.S. Senate to the GOP after narrowly defeating Democratic Sen. Kay Hagan. During his more than a decade in office, he championed issues such as mental health and substance abuse recovery, Medicaid expansion and support for veterans.

As a more moderate Republican, Tillis became known for his willingness to work across the aisle on some issues. That got him into trouble with his party at times, most notably in 2023 when North Carolina Republicans voted to censure him over several matters, including his challenges to certain immigration policies and his gun policy record.

“Sometimes those bipartisan initiatives got me into trouble with my own party,” Tillis said, “but I wouldn’t have changed a single one.”

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Associated Press writers Lisa Mascaro and Joey Cappelletti in Washington and Makiya Seminera in Raleigh, North Carolina, contributed to this report.