Rep. Jared Golden (D-Maine) announced Wednesday he won’t seek reelection, citing threats against his family and the ongoing government shutdown.

Golden has often bucked his party on key votes, including on the recent government funding bill. His retirement from a district that also voted for President Donald Trump could make it more difficult for Democrats to win control of the House of Representatives next year.

Golden cited recent incidents of political violence, including the assassination attempt on Trump as a major factor in his decision.

“These have made me reconsider the experiences of my own family, including all of us sitting in a hotel room on Thanksgiving last year after yet another threat against our home,” Golden wrote in the Bangor Daily News.

Golden also pointed to partisan gridlock on Capitol Hill and the funding impasse that has forced thousands of federal employees to work without pay and threatened food assistance for millions. Golden was the only House Democrat who voted for the funding bill that passed the House in September only to stall in the Senate.

“This unnecessary, harmful shutdown and the nonstop, hyperbolic accusations and recriminations by both sides reveal just how broken Congress has become,” Golden wrote.

The soft-spoken 43-year-old Marine faced a Democratic primary challenger next spring who criticized Golden for voting with Republicans. He also faced a potentially formidable Republican general election opponent in former two-term Maine Gov. Paul LePage. Golden said last month he would be a better candidate against LePage than his Democratic primary challenger.

On Wednesday, Golden insisted fears of losing an election had nothing to do with his decision. He just doesn’t want to serve in Congress instead of spending time with his family.

“I don’t fear losing,” he wrote. “What has become apparent to me is that I now dread the prospect of winning.”

Golden’s announcement came after a Democratic sweep in off-year elections in Virginia and New Jersey, and amid the most optimism Democrats have felt since Trump won the White House last November.

In a statement, Rep. Suzan DelBene (D-Wash.), chair of the Democratic Congressional Campaign Committee, the organization tasked with winning back the House, praised Golden for his bipartisanship and his efforts to revitalize the moderate Blue Dog Coalition among House Democrats.

“Democrats will do everything necessary to keep this seat blue so that Mainers continue to have a voice fighting for them in Congress — and we are confident we will be successful,” DelBene said.