Republican National Committee Chairman Reince Priebus is slamming efforts within his party to organize a third-party candidate to block presumptive GOP presidential nominee Donald Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE from the White House.

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"They may as well jump off the top floor of a building because that’s what we’d be doing by having a third party," Priebus told Reuters on Friday.

Priebus argued that an independent run at the presidency would imperil the GOP’s efforts to maintain its majority in the Senate, where it has several vulnerable members up for reelection.

"If you don't participate in the presidential election, you might as well kiss away the Senate as well," he said.

"The Senate goes as the presidential race goes. They’re inextricably intertwined."

Priebus has been attempting to rally the party around its presumptive nominee. He helped organize a meeting this week between Speaker Paul Ryan Paul Davis RyanKenosha will be a good bellwether in 2020 At indoor rally, Pence says election runs through Wisconsin Juan Williams: Breaking down the debates MORE (R-Wis.) and Trump, which he says helped develop a relationship between the two.

"My guess is they may even be talking today and through the weekend [on the phone]," he said.