Former president and current GOP primary frontrunner Donald Trump has shaken up the U.S. Senate race in Montana after issuing a surprise endorsement.

Trump declared in a post on his social media platform, Truth Social, that he would be supporting retired U.S. Navy SEAL and businessman Tim Sheehy for the Senate seat currently held by Sen. Jon Tester (D-MT), who first took office in 2007. The former president’s endorsement came on the same day that Rep. Matt Rosendale (R-MT), one of the eight lawmakers who voted to oust RINO former Speaker of the House Kevin McCarthy (R-CA), announced his candidacy for the Senate seat.

“I LOVE MONTANA! Tim Sheehy is an American Hero and highly successful Businessman from the Great State of Montana,” Trump wrote in the Truth Social post. “He is strongly supported by our incredible Chairman of the NRSC, Steve Daines, and many other patriotic Senators and Republicans who have endorsed our Campaign to, MAKE AMERICA GREAT AGAIN! I also respect Matt Rosendale, and was very happy to Endorse him in the past – and will Endorse him again in the future should he decide to change course and run for his Congressional Seat.”

“But in this instance, Tim is the candidate who is currently best-positioned to DEFEAT Lazy Jon Tester, and Regain the Republican Majority in the United States Senate,” he added. “Tim is a Political Outsider, Strong on the Border, the Military/Vets, and our constantly under siege Second Amendment. He will stand tall in the fight against the Radical Left Democrats, who are Destroying our Country. Also, he is far more likely to Defeat Lazy Jon. America First Patriot Tim Sheehy has my Complete and Total Endorsement!”

Meanwhile, many Trump supporters on social media are frustrated with the endorsement, as they have pointed out that Sheehy is endorsed by RINO Senate Minority Leader Mitch McConnell (R-KY), has donated to warmonger GOP primary candidate Nikki Haley and has called for U.S. troops to be sent to fight in the Ukraine war.

Tim Sheehy:

• Called for US troops in Ukraine.
• Donated to Nikki Haley right after Jan. 6.
• Donated to Tim Scott right after Trump was indicted.
• Is backed by Mitch McConnell.

Matt Rosendale:

• Has the best voting record in Congress.
• Is hated by the establishment.

— Yitzy (@YitzyBergman) February 9, 2024

“Sweden and Finland are next? We’ve seen this movie before….stop him now before the price tag for putting Putin down will be a lot higher,” Sheehy wrote last year on his LinkedIn page, referring to Russian President Vladimir Putin. “Georgia, Crimea, Syria, now Kiev- then what? Estonia? Finland? Sweden? Gofund me pages and twitter likes aren’t enough. Soldiers, planes, bombs and bullets will be needed against this Tyrant.”

He has since appeared to change his mind on the issue, declaring that it was time for a “peaceful outcome” since “America has done our duty in stopping this vicious and unprovoked attack.”

Changing his tune was not enough for many Trump supporters though, who are expressing disappointment with Trump’s endorsement.

“President Trump still has an advice problem. This has ALWAYS been a major pain point for him. He’d be wise to RESCIND his endorsement of Tim Sheehy for U.S. Senate immediately. Sheehy is backed by RINO McConnell and the gang. He’s not America FIRST! Hard pass,” wrote one user.

President Trump still has an advisement problem. This has ALWAYS been a major pain point for him. He’d be wise to RESCIND his endorsement of Tim Sheehy for U.S. Senate immediately. Sheehy is backed by RINO McConnell and the gang. He’s not America FIRST! Hard pass.

ROSENDALE! ✅ pic.twitter.com/a1lYXv9nn8

— Suburban Black Man 🇺🇸 (@niceblackdude) February 10, 2024

Even former Trump advisor Steve Bannon has previously spoken out against Sheehy.

Bannon: Steve Daines got us into this Ukraine mess & one of his accolades @SheehyforMT wants to send American combat troops. They are certainly not right for the United States & they’re certainly not right for Montana. @MattForMontana pic.twitter.com/6M5IFUJ8Zx

— Grace Chong 🇺🇸 (@gc22gc) February 9, 2024

Meanwhile, Rosendale has also expressed his frustration with Trump endorsing his primary opponent.

“I love President Trump. But he needs actual fighters in the U.S. Senate to enact his Agenda 47 – and that’s me and not Mitch McConnell’s hand pick, Tim Sheehy. I’m going to win this primary, defeat Jon Tester in November and together we will Make America Great Again!” the Montana congressman wrote in a post on X, formerly known as Twitter.

I love President Trump. But he needs actual fighters in the U.S. Senate to enact his Agenda 47 – and that’s me and not Mitch McConnell’s hand pick, Tim Sheehy.

I’m going to win this primary, defeat Jon Tester in November and together we will Make America Great Again!

— Matt Rosendale (@MattForMontana) February 9, 2024

Rosendale also appeared on CNN, where he pointed out that Sheehy gave a 30-minute speech at the Montana GOP convention and never once mentioned Trump or his endorsement.

Rosendale says that at tonight’s MTGOP convention, @SheehyforMT NEVER once mentioned President Trump’s endorsement throughout his 30 min speech.

Maybe it’s bc Sheehy maxed out his contributions to Nikki Haley & Tim Scott against President Trump?🤔 https://t.co/9fyeEH2uQF pic.twitter.com/MJuWvl94Xi

— Grace Chong 🇺🇸 (@gc22gc) February 10, 2024