© Greg Nash
Republican National Committee Chairman Reince Priebus on Friday slammed the prospect of a third-party presidential campaign, saying it would ensure a Hillary ClintonHillary Diane Rodham ClintonThe Hill's Morning Report - Presented by Facebook - Democrats see victory in a voting rights defeat Left laughs off floated changes to 2024 ticket A year into his presidency, Biden is polling at an all-time low MORE White House.
"The amount of time, energy, money, and also it's a guarantee to elect Hillary Clinton. When people start to take a breath and let some of this calm down, people will understand not to let differences in choices” jeopardize the party, Priebus said at a Politico breakfast event.
Donald TrumpDonald TrumpSanders calls out Manchin, Sinema ahead of filibuster showdown Laura Ingraham 'not saying' if she'd support Trump in 2024 The Hill's 12:30 Report: Djokovic may not compete in French Open over vaccine requirement MORE this week clinched the title of presumptive GOP presidential nominee, but many Republicans have expressed concern about his candidacy.
Sen. Ben Sasse (R-Neb.) called for an "adult" third-party candidate for conservatives to back, while House Speaker Paul RyanPaul Davis RyanOn The Trail: Retirements offer window into House Democratic mood Stopping the next insurrection Former Sen. Bob Dole dies at 98 MORE (R-Wis.) said Thursday that Trump had not yet earned his support.
Trump needs to make concrete efforts to help the party coalesce around his candidacy, Priebus said Friday.
"A smart thing for Donald Trump to do would be to release five to 10 names of people he would pool from to say, 'Here's 10 folks that I think would make great Supreme Court justices,'" he said.
"Things like that would be helpful in recalibrating some minds."
Trump has promised to release a list of potential Supreme Court picks, but he has not yet done so.