U.S. Rep. Thomas Massie faces a tough Republican primary challenge Tuesday in Kentucky's 4th Congressional District, where farmer and former Navy SEAL Ed Gallrein entered the race at Donald Trump's urging. Massie is seeking the GOP nomination for an eighth full term, and the contest is one of the marquee fights in the Kentucky primary 2026.
The district in northern Kentucky stretches along the Ohio River and borders Indiana and Ohio. Trump carried all 21 counties there in 2024 with about 67% of the vote, a sign of the president's continued strength in the area even as Massie won 65% in his 2022 reelection bid and carried every county. He ran unopposed in 2024, making Tuesday the first real test of whether his hold on the district has weakened.
That question matters because Kentucky's primary electorate is not especially large, and it is tightly sorted by party. As of April 24, the state had about 3.4 million registered voters, including about 1.6 million registered Republicans and about 1.4 million registered Democrats. Only voters registered with a political party may take part in that party's primary, which means Democrats cannot vote in the Republican contest and independents or unaffiliated voters cannot participate in either primary.
Polls close at 6 p.m. local time. In most of Kentucky that means 6 p.m. ET, while polling places in the Central Time Zone close at 7 p.m. ET. The result will show whether Massie's years of local support can withstand a challenge tied closely to Trump, whose endorsement power has already shaped the race.
The primary is not limited to Massie's district. Kentucky voters are also choosing nominees for U.S. Senate, five other U.S. House seats and the state General Assembly. Nearly 20 candidates are competing to replace Mitch McConnell in the Senate, which is open because he is retiring after seven terms. Among the 11 Republican candidates are U.S. Rep. Andy Barr, who has Trump's endorsement, and former state Attorney General Daniel Cameron, a former McConnell aide. Seven candidates are seeking the Democratic nomination.
In Louisville, voters are also narrowing a crowded mayoral field. Craig Greenberg is seeking a second term and faces 10 other candidates in the city's nonpartisan primary, where the top two vote-getters advance to the general election. That makes Tuesday a test not just for one Republican incumbent in northern Kentucky, but for party loyalty and local power across the state.
For Massie, the stakes are straightforward. He has survived before, but Tuesday is the first time in years that a Trump-backed challenger has forced him into a fight for the nomination he needs to stay in Congress. If Gallrein can turn Trump's support into enough votes, it would mark the clearest sign yet that Massie's grip on the district is no longer secure.
