Sen. Ben Sasse (R-Neb.) on Tuesday vowed to give up on the GOP if Donald Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response 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."

ADVERTISEMENT

“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 Rubio Marco Antonio RubioFlorida senators pushing to keep Daylight Savings Time during pandemic Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll Intelligence chief says Congress will get some in-person election security briefings MORE or Ted Cruz Rafael (Ted) Edward CruzLoeffler calls for hearing in wake of Netflix's 'Cuties' Health care in the crosshairs with new Trump Supreme Court list 'Parks and Rec' cast members hosting special reunion to raise money for Wisconsin Democrats MORE instead denotes “treason to your heritage."