Sen. Ben Sasse (R-Neb.) on Tuesday vowed to give up on the GOP if Donald TrumpDonald TrumpJulian Castro knocks Biden administration over refugee policy Overnight Energy & Environment — League of Conservation Voters — Climate summit chief says US needs to 'show progress' on environment Five takeaways from Arizona's audit results 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."
“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 RubioThe Memo: Biden's immigration problems reach crescendo in Del Rio Democrats face bleak outlook in Florida The Hill's 12:30 Report - Presented by Facebook - Dems attempt to tie government funding, Ida relief to debt limit MORE or Ted CruzRafael (Ted) Edward CruzFBI investigating alleged assault on Fort Bliss soldier at Afghan refugee camp The Memo: Biden's immigration problems reach crescendo in Del Rio Matthew McConaughey on potential political run: 'I'm measuring it' MORE instead denotes “treason to your heritage."