Sen. Ben Sasse (R-Neb.) on Tuesday vowed to give up on the GOP if Donald TrumpDonald John TrumpBiden slams Trump over golf gif hitting Clinton Trump Jr. declines further Secret Service protection: report Report: Mueller warned Manafort to expect an indictment MORE wins the party’s presidential nomination.

“Let’s first recognize that the Republican Party is just a tool, as all political parties are,” he told hosts Joe Scarborough and Mika Brzezinski on MSNBC’s “Morning Joe."

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“I signed up for the party of Abraham Lincoln, not the party of David Duke, Donald Trump,” Sasse continued, linking the white nationalist with Trump’s White House run.

“I hope it happens over the course of the next 30 to 60 days that the Republican Party again becomes the party of Abraham Lincoln, limited government and great human potential. I want to celebrate what’s great about America in the Republican Party, but if the Republican Party becomes the party of David Duke, Donald Trump, I’m out.”

Sasse then rejected the notion that Trump could evolve into a stronger conservative.

“I don’t that this guy has any more core principles than a Kardashian marriage,” he said. "Do any of you think Donald Trump has any core values? I don’t think it’s conceivable."

Sasse additionally slammed his own party for helping fuel Trump’s popularity with voters nationwide.

“The core principles of the Republican Party have not been clear,” he said. "Ultimately, Donald Trump has seized upon a vacuous, falling-apart organization.”

Sasse has repeatedly challenged Trump’s fitness for the presidency, most recently penning an open letter late last Sunday night rejecting the billionaire’s campaign.

Trump is currently under fire for his hesitancy to denounce support from Duke, a former grand wizard in the Ku Klux Klan.

Duke urged listeners on his radio show last week to vote for the real estate tycoon, arguing that picking either Marco RubioMarco Antonio RubioOvernight Defense: Senate passes 0B defense bill | 3,000 US troops heading to Afghanistan | Two more Navy officials fired over ship collisions Senate passes 0B defense bill Trump bets base will stick with him on immigration MORE or Ted CruzRafael (Ted) Edward CruzSenate Dems hold floor talk-a-thon against latest ObamaCare repeal bill Overnight Finance: CBO to release limited analysis of ObamaCare repeal bill | DOJ investigates Equifax stock sales | House weighs tougher rules for banks dealing with North Korea GOP state lawmakers meet to plan possible constitutional convention MORE instead denotes “treason to your heritage."