Sen. Ben Sasse (R-Neb.) on Tuesday vowed to give up on the GOP if Donald TrumpDonald TrumpDem senator: Pardoning targets of Russia probe would be 'crossing a fundamental line' Trump lawyers looking into special counsel's potential conflicts of interest: reports Trump lawyers asking about presidential pardon powers: report 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 RubioBush ethics lawyer: Congress must tell Trump not to fire Mueller The private alternative to the National Flood Insurance Program  Cruz offers bill to weaken labor board's power MORE or Ted CruzTed CruzCruz offers bill to weaken labor board's power Overnight Finance: GOP offers measure to repeal arbitration rule | Feds fine Exxon M for Russian sanctions violations | Senate panel sticks with 2017 funding levels for budget | Trump tax nominee advances | Trump unveils first reg agenda The Hill's 12:30 Report MORE instead denotes “treason to your heritage."