Republican National Committee Chairman Reince Priebus is furious with Donald Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE's refusal to endorse House 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.) or Sen. John McCain John Sidney McCainMomentum growing among Republicans for Supreme Court vote before Election Day McConnell urges GOP senators to 'keep your powder dry' on Supreme Court vacancy McSally says current Senate should vote on Trump nominee MORE (R-Ariz.), NBC News reported.

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Priebus is “apoplectic” over Trump’s remarks and called campaign chairman Paul Manafort and other top staffers to voice his “extreme displeasure,” NBC reported, citing a source in the GOP.

Trump said in an interview with The Washington Post on Tuesday that he is "not quite there yet" in terms of endorsing Ryan. The terminology echoed what Ryan said of Trump in May, before the Speaker relented and endorsed Trump for president.

He also tweeted praise of Ryan’s primary opponent, Paul Nehlen, on Monday.

Priebus and Ryan have deep connections going back to their days in Wisconsin state politics.

Trump also sharply criticized McCain, who is facing a tough primary challenge, as well as Sen. Kelly Ayotte Kelly Ann AyotteBottom line Bottom line Bottom Line MORE (R-N.H.), who is in a tight general election battle.