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 TrumpFive takeaways from Gillum and DeSantis’s first debate GOP warns economy will tank if Dems win Gorbachev calls Trump's withdrawal from arms treaty 'a mistake' MORE's refusal to endorse House Speaker Paul RyanPaul Davis RyanPelosi, Schumer: Trump 'desperate' to put focus on immigration, not health care Trump urges Dems to help craft new immigration laws: ‘Chuck & Nancy, call me!' Sanders, Harris set to criss-cross Iowa MORE (R-Wis.) or Sen. John McCainJohn Sidney McCainMeghan McCain calls Russian attacks against her father the 'highest compliment' to her family Arizona Dems hope higher Latino turnout will help turn the state blue McConnell: GOP could try to repeal ObamaCare again after midterms 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 AyotteElection Countdown: O'Rourke brings in massive M haul | Deal on judges lets senators return to the trail | Hurricane puts Florida candidates in the spotlight | Adelson spending big to save GOP in midterms GOP mulls having outside counsel question Kavanaugh, Ford Pallbearers, speakers announced for McCain's DC memorial service and Capitol ceremony MORE (R-N.H.), who is in a tight general election battle.