Priebus furious at Trump for not endorsing Ryan: report
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Republican National Committee Chairman Reince Priebus is furious with Donald TrumpDonald John TrumpIvanka Trump pitches Goya Foods products on Twitter Sessions defends recusal: 'I leave elected office with my integrity intact' Former White House physician Ronny Jackson wins Texas runoff MORE's refusal to endorse House Speaker Paul RyanPaul Davis RyanBush, Romney won't support Trump reelection: NYT Twitter joins Democrats to boost mail-in voting — here's why Lobbying world MORE (R-Wis.) or Sen. John McCainJohn Sidney McCainKelly leads McSally by 9 points in Arizona McCain's reset: US-Vietnam relations going strong after 25 years Senate outlook slides for GOP 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 AyotteKelly Ann AyotteBottom line Bottom line Bottom Line MORE (R-N.H.), who is in a tight general election battle.