GOP Montana Senate candidate Tim Sheehy blasted Rep. Matt Rosendale (R-MT) for being a "career politician" whom "nobody likes."

"There's a difference between an outsider and an insider nobody likes. He is an insider nobody likes who's running for his third term in Congress and has been a career politician," Sheehy said in a Tuesday morning interview with Brian Kilmeade on Fox and Friends.

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"I'm actually an outsider: combat veteran, five deployments ... businessman, created hundreds of jobs in Montana," Sheehy continued. "I'm running because I care about the future of this nation, about my children's future, and I realize the problems we need to solve need to be solved by a new generation of leaders."

The comments stemmed from a post that Rosendale made on X, formerly known as Twitter, in June about Sheehy being Senate Minority Leader Mitch McConnell's (R-KY) "chosen candidate." He made the post on the same day Sheehy announced his bid for Senate.

"Congratulations to Mitch McConnell and the party bosses on getting their chosen candidate," Rosendale tweeted. "Now Washington has two candidates — Tim Sheehy and Jon Tester — who will protect the DC cartel."

When asked by Kilmeade if he was McConnell's "chosen candidate," Sheehy said, "Absolutely not."

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There is rising speculation that Rosendale will run for the Republican nomination for Montana's Senate race to defeat Sen. Jon Tester (R-MT), who is up for reelection in 2024. Sheehy has received support from several established Republicans, including National Republican Senatorial Committee Chairman Steve Daines (R-MT).

With Rosendale's possible entry, Senate Republicans worry a crowded primary may weaken their candidate in the general election, similar to the fate of many GOP candidates during the 2022 midterm elections. Rosendale ran an unsuccessful bid for Tester's seat in 2018.