Former Navy SEAL Ed Gallrein has won the Republican primary in Kentucky’s 4th Congressional District over Rep. Thomas Massie, NBC News projects, notching another win for President Donald Trump in his push to eliminate political rivals and roadblocks within his own party.

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Gallrein beat Massie in the most explosive fight of Trump’s political pressure campaign, which wended its way from Indiana and Louisiana to Kentucky this month, all featuring primary challengers he endorsed. Gallrein was aided by an extraordinary advertising blitz fueled largely by pro-Trump and pro-Israel groups.

Massie, first elected to the House in 2012, had become an ever-present thorn in Trump’s side. Trump traveled to the district in March to throw his political weight behind Gallrein and slammed Massie as a “disaster.”

Known as an anti-war libertarian and deficit hawk, Massie drew ire from Trump and his allies for opposing the war in Iran, as well as Trump’s “big, beautiful bill” spending package. Massie, along with Rep. Ro Khanna, D-Calif., also was one of the chief proponents of releasing the Justice Department’s files related to investigations of the late sex offender — and onetime Trump friend — Jeffrey Epstein.

Massie’s prospects of outmaneuvering Trump became even more tenuous over the final days of the race.

In Louisiana, Sen. Bill Cassidy, a Republican who similarly got crosswise with Trump, failed to advance from the party’s primary in his re-election bid Saturday, underscoring how unflinchingly loyal GOP voters remain to Trump.

And when Rep. Lauren Boebert, R-Colo, campaigned with Massie, Trump threatened to revoke his endorsement of her.

Meanwhile, Defense Secretary Pete Hegseth traveled to Kentucky on Monday for a last-minute appearance with Gallrein — an unusual and overtly political move for a defense secretary but one the Defense Department said Hegseth was making in his personal capacity.

“There’s a portion of the electorate who doesn’t believe that Congress should be independent,” Massie said in an interview last month. “They believe that, when the Republicans control the White House and the Congress, that Congress should just do whatever the president wants. But that’s not how our government’s set up.”

Massie faced an onslaught of ads, many of them negative, led by MAGA KY, a super PAC directed by Trump adviser Chris LaCivita. The group’s attacks focused in part on immigration and border security provisions in Trump’s spending bill. Pro-Israel groups affiliated with the Republican Jewish Coalition and the American Israel Public Affairs Committee, or AIPAC, also poured millions of dollars onto the state’s airwaves to boost Gallrein.

Spots promoting Gallrein or attacking Massie accounted for more than $19 million of the $33 million spent on advertising in the primary, according to AdImpact, an ad-tracking firm. But pro-Massie forces made noise, as well. The Massie-aligned Kentucky 4th PAC aired a spot called “Tucked Tail And Ran” that used war imagery to emphasize Gallrein’s departure from the GOP during Trump’s first term. The ad depicted Gallrein leaving Trump behind in a foxhole.

Gallrein kept a low profile, choosing to let Trump’s endorsement speak for him and drawing criticism from Massie for dodging debates and other candidate forums.

“It’s like they have a tracker on my car and keep from getting within 50 miles of me,” Massie said last month. “He is scared to answer any question, even if I don’t get to ask the questions.”

Massie’s defeat follows other losses this month by Republican state lawmakers in Indiana who had resisted a Trump-backed congressional redistricting push. Five challengers endorsed by Trump defeated sitting state senators in their primaries.

Another Trump victory came Saturday in Louisiana, where Cassidy, who had voted to convict Trump in his impeachment trial after the Jan. 6, 2021, attack on the Capitol, finished third in his re-election primary. Trump-endorsed Rep. Julia Letlow and state Treasurer John Fleming advanced to a June 27 runoff.

Massie told NBC News last month that the outcome of his primary could determine whether more Republicans and Congress are willing to stand up to Trump.

“They’re trying to decide,” Massie said, “could they win an election?”

Trump campaigned via phone for three GOP candidates in Kentucky yesterday, urging voters to back candidates that include the challenger to Rep. Thomas Massie.

Trump split time during the event advocating for Rep. Andy Barr for Senate, Ralph Alvarado for the 6th Congressional district and Ed Gallrein for the 4th Congressional District where Massie is the representative.

“This is a group, great group of people, but that’s in Kentucky’s 4th Congressional District against a disastrous Thomas Massie. I say, he’s the worst Republican congressman in the history of the country,” Trump said.

“You need to send Ed Gallrein to fight for you in Washington,” Trump said during the call.

Gallrein called the primary a “pick a side moment,” arguing that a vote for Massie — who has previously said he votes with the GOP “90% of the time”  — would be “picking the radical Democrats” over “President Trump, the Republican Party and the Constitution.”

KENTUCKY (WKYT) – President Donald Trump’s endorsements of several Kentucky candidates have drawn attention to Tuesday’s U.S. Senate and House primary races, with political experts and party officials weighing in on the potential impact on voters.

Trump has been vocal on social media and in interviews about who should represent Kentucky in Washington.

“Something like an endorsement from President Trump or good coverage in partisan media can make the difference,” said Dr. Stephen Voss, a specialist in elections and voting behavior at the University of Kentucky.

Voss said presidential endorsements, especially from Trump, can easily sway a close election. He said the average voter is looking for a shortcut on who to push forward in the primary.

“Party identification drives how a lot of people vote, but in a party primary, that doesn’t help,” Voss said. “Voters in Kentucky that are republican are choosing republican politicians; voters need shortcuts so they can get their homework done, pick a candidate and move on. A Donald Trump endorsement for a lot of voters is the guideline they’d use to determine how to vote.”

Questions still remain surrounding Trump’s decisions to speak against certain candidates who have disagreed with him, including U.S. Representative Thomas Massie. The president endorsed Massie’s opponent, Ed Gallrein.

Kentucky Democratic Party Chair Colmon Elridge called it petty politics.

“Who we send to congress, who’s in the United States Senate — they affect people’s real lives and Donald Trump really is detached from the lives of the Emerican people and people right here in Kentucky,” Elridge said.

Adam Hope with the Republican Party of Kentucky said while the party cannot show favoritism, they support Trump’s decisions.

“Our president is definitely endorsing some candidates he feels like are gonna get the job done and advance his agenda in the best way he sees fit,” Hope said.

Hope said while these endorsements may not necessarily bring more people to the polls, they will get more people’s attention as to why primary races are important.