President Donald Trump turned his attention to Kentucky's 4th Congressional District late Saturday night, firing off a series of Truth Social posts demanding that Republican voters remove Rep. Thomas Massie from office in Tuesday's primary, and pointing to Sen. Bill Cassidy's stunning failure to advance in Louisiana's GOP Senate primary as proof of what happens to Republicans who break ranks.
The posts, which began shortly after midnight and continued into Sunday morning, represent the sharpest escalation yet in a feud that has simmered since at least 2020. Trump endorsed challenger Ed Gallrein, a Kentucky farmer and military veteran, and cast the race as a referendum on loyalty to the Republican agenda.
Fox News Digital reported that Trump tied Massie directly to Cassidy's loss, writing on Truth Social:
"Tom Massie of Kentucky, the worst and most unreliable Republican Congressman in the history of our Country, is an even bigger insult to our Nation than Senator Bill Cassidy of Louisiana, who suffered an unprecedented loss tonight by not even being allowed to run in the Republican Primary."
Trump added: "This is the first time such a thing has ever happened to a sitting U.S. Senator!"
The backdrop for Trump's broadside against Massie was Saturday night's Louisiana Republican Senate primary, where Cassidy, a sitting U.S. senator, failed to advance past the first round. Julia Letlow led the field, with state Treasurer John Fleming finishing second. The two will face each other in a June 27 runoff after no candidate cleared a majority.
Cassidy was one of seven Republican senators who voted to convict Trump after the Jan. 6 election protest in Trump's second impeachment trial. Trump declared Cassidy's "political career is OVER!" and said the result was the direct consequence of disloyalty.
"That's what you get by voting to Impeach an innocent man, especially one who made it possible for Cassidy's Senate win."
Trump congratulated Letlow, saying she ran a "fantastic race" and would "make a brilliant Senator" after "taking care of some additional business", a reference to the June runoff.
With Cassidy dispatched, Trump pivoted immediately to the next target on his list. The message was plain: Massie should expect the same fate.
Massie has represented Kentucky's 4th District, stretching across northern Kentucky, since 2012. Trump has called him a "grand-stander" for voting against the Republican agenda in the House since 2020. The friction intensified in March 2025 when Massie opposed a short-term government funding bill, prompting Trump to publicly call for a primary challenge.
In his Sunday morning post, Trump laid out the bill of particulars. He wrote that Massie "voted against Tax Cuts, the Border Wall, our Military and Law Enforcement" and added: "Actually, he voted against almost everything that is good. The Worst Republican Congressman in History."
Trump's frustration extends beyond policy votes. As we previously covered, Trump took the fight directly to Massie's home turf in recent weeks, making the Kentucky primary a personal priority.
Massie, for his part, has pushed back. Speaking to reporters after a Kentucky campaign rally Saturday, the congressman framed the conflict as a matter of independence.
"Someone thinks they can control my voting card by threatening my reelection."
That quote, from last year, captures the posture Massie has maintained throughout the feud. He has pointed to his work pushing for release of the Jeffrey Epstein files and his opposition to what he described as Trump's earlier push toward conflict with Iran as evidence that he votes on principle, not party loyalty.
The dispute has pulled in other Republican figures. Rep. Lauren Boebert of Colorado and Sen. Rand Paul of Kentucky both stumped for Massie in the final stretch before Tuesday's vote, a decision that drew immediate fire from the president.
Hours before Cassidy's defeat, Trump wrote on Truth Social that Boebert and Paul were "parading around like fools" in Kentucky for Massie. He described them as "two very difficult, and highly unreasonable, Republican Votes."
Trump then went further, openly threatening to pull his endorsement of Boebert in Colorado's 4th Congressional District:
"Even though I long ago endorsed Boebert, if the right person came along, it would be my Honor to withdraw that Endorsement, and endorse a good and proper alternative. Just let me know, or announce your Candidacy, and I will be there for you!"
Massie responded to that threat with a note of practical reality. He told reporters that Boebert's primary was already closed, so calls for a challenger were moot. And Paul, he noted, was not on the ballot this year.
"And Rand Paul's not on the ballot this year. You're going to have to wait two whole years. So I think he should be mending fences with these folks, not trying to burn bridges."
Massie's warning about fracturing the Republican base through expensive intra-party fights has been a consistent theme of his campaign defense.
Whatever the outcome Tuesday, the scale of the Kentucky contest is already historic. Newsmax reported that the Massie-Gallrein race has become the most expensive U.S. House primary on record, with more than $32 million in advertising. That figure alone signals how seriously Trump and his allies have invested in removing Massie from Congress.
The spending total dwarfs what most House incumbents face in a general election, let alone a primary. It reflects a deliberate strategy: make the cost of defying the party's standard-bearer so high that other would-be dissenters think twice. The sheer volume of money pouring into a single Kentucky district has drawn national attention to what would otherwise be a regional contest.
Trump's endorsement of Gallrein has been full-throated. He described the challenger as "a true American Patriot, a Farmer from Kentucky, and a Military Hero" and said Gallrein "only ran because he thought that Massie was so disloyal and disrespectful to your President, ME!"
In another post, Trump called Gallrein "Central Casting" and said he "truly deserves to represent the fantastic people of Kentucky, a Commonwealth that I am proud to have won all three times, in record fashion!"
The Massie primary does not exist in a vacuum. Trump has made clear that Republicans who vote against his agenda will face consequences at the ballot box. Cassidy's failure to advance in Louisiana is the most dramatic example to date, a sitting senator knocked out before the runoff, but the pattern extends well beyond one state.
Earlier this cycle, Trump-endorsed challengers ousted five GOP incumbents in Indiana and swept the Ohio primary, demonstrating that the president's endorsement carries real weight in Republican contests.
Trump has also kept pressure on Congress through policy demands, including his push to attach the SAVE America Act to key legislation, testing which members will stand with him and which will not.
The question facing Kentucky's 4th District voters Tuesday is straightforward: Does a congressman who has voted against tax cuts, border security funding, and military spending deserve another term? Trump has made his answer clear. Massie insists his independence is the point.
The polls open with both sides claiming momentum. Trump pointed to Cassidy's defeat as a warning. Massie pointed to his record of principled stands and the support of Paul and Boebert as proof that the GOP's libertarian-leaning wing still has a constituency.
Trump closed with the kind of language that leaves no room for ambiguity. He called Massie "a disloyal, ungracious, and sanctimonious FOOL, who almost never votes for even the best of Republican Values" and urged voters to "WIPE AWAY THE STENCH OF ONE OF THE WORST CONGRESSMEN IN THE HISTORY OF OUR GREAT PARTY."
He ended simply: "ED WILL NEVER LET YOU DOWN. MAKE AMERICA GREAT AGAIN!"
Voters in northern Kentucky will have the final word. But the message from the top of the Republican Party is as clear as it has ever been: elections have consequences, and so do the votes you cast once you get to Washington.
