Rep. Thomas Massie (R-KY) has survived bruising political fights before, but the most expensive U.S. House primary in American history may pose the greatest threat yet to his political career.
The Kentucky Republican has been a thorn in President Donald Trump’s side for much of his second term, emerging as a vocal critic of the administration’s handling of the Epstein files, Iran, and the president’s signature “One Big, Beautiful Bill.”
Now, Trump is backing a primary challenger in a campaign to end Massie’s congressional career.
In January, Trump — widely seen as the GOP’s kingmaker — endorsed Captain Ed Gallrein, a retired Navy SEAL and farmer opposing Massie in Kentucky’s 4th Congressional District.
“The incredible people of Kentucky’s 4th Congressional District, who want desperately to get rid of Thomas Massie, the Worst ‘Republican’ Congressman we have had in many years, gave us a mandate to MAKE AMERICA GREAT AGAIN!” Trump said in a Truth Social post. “The person that will help us do the job, and do it right, is Navy SEAL, Army Ranger, Fifth Generation Kentucky Farmer, and American Hero, Captain Ed Gallrein, a true Patriot.”
Axios reported that more than $25 million has poured into the contest, including a wave of outside spending from deep-pocketed third-party groups, making it the most expensive House primary in American history.
Conventional political wisdom suggests Massie enters Tuesday’s primary with significant structural advantages. The libertarian-minded fiscal hawk has deep roots in the district, riding the Tea Party wave into Congress in 2012 and remaining politically untouchable ever since.
Yet, Massie’s tendency to break with Trump and Republican leadership has angered the White House and may be alienating segments of the MAGA faithful.
A new Quantus Insights survey shows Gallrein leading Massie 53%-45% among likely Republican primary voters, marking the first public poll to show the Trump-backed challenger ahead.
“Massie retains a substantial base, but the topline suggests that a meaningful share of the Republican primary electorate is already prepared to move in another direction,” the polling firm said, pointing to Massie’s durable appeal as a fiscal conservative skeptical of leadership.
“Gallrein’s support reflects the power of Trump’s endorsement, the weight of national conservative attention, and the ability of a challenger to consolidate voters who believe the district needs a different representative,” the polling analysis added.
The same pollster in April showed Massie ahead 47%-38%, a double-digit swing toward Gallrein in one month. Prediction markets moved on the news. Kalshi now gives Gallrein a 50% chance of winning Tuesday’s primary, up from 33% on Tuesday.
The fresh polling wasn’t the only setback for the Kentucky Republican. On Wednesday, a former girlfriend accused Massie of offering her $5,000 to withdraw a wrongful termination complaint against Congresswoman Victoria Spartz (R-IN), according to Axios.
“It’s sad that a week before this election, people are making false and unsubstantiated allegations about me in an obvious attempt to influence the outcome of this election,” Massie said. “All of the claims of inappropriate conduct are false. I’ve never offered anyone money in exchange for their silence. I report all of my farm income, including cash, to the IRS.”
On the campaign trail, Massie acknowledged the tightening race.
“The race is within the margin of error,” Massie told a local news outlet on Tuesday. “I think it’s going to be close. I really do. I feel like I’m going to win. I feel like the enthusiasm is on the ground here.”
At a Monday campaign event in Boone County, signs of a fractured Republican base were on full display.
“I support the president more than any other time… Give me a reason to vote for you this time,” one female voter told Massie.
Massie responded in part, “First of all, I’m not running against Donald Trump.”
Another male voter fired back, “I don’t understand why you vote against Trump.”
Other voters, including Cathy Beil, appreciate Massie’s independence from the president.
“He’s a man of his word, and he’s not afraid to stand up for what his constituents want from him,” Beil told WHAS11.
“Thomas Massie inspires confidence without being a con man, and that’s why Donald Trump hates him,” another Massie supporter said.
Trump’s relationship with Massie has been a roller-coaster ride.
In March 2020, Trump called Massie a “third rate Grandstander” and urged the GOP to kick him out of the party. Two years later, Trump endorsed Massie in his Republican primary, referring to him as a “Conservative Warrior” and a “first-rate Defender of the Constitution,” The Daily Wire previously reported.
But during Trump’s second term, Massie has regularly criticized the administration’s foreign and domestic policies.
Massie also condemned the capture of Venezuelan dictator Nicolás Maduro, arguing that the operation was only “about oil and regime change.”
“This is not what we voted for,” he said.
Kentucky’s 4th Congressional District primary is set for Tuesday, May 19.
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