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Priebus, a close friend of Ryan, is deeply irritated by Trump’s recent actions and his unwillingness to accept guidance from senior advisers. The party chairman has already been speaking with campaign chairman Paul Manafort and the candidate’s grown children, who are said to agree that he needs to stop picking fights within his own party.

“The candidate is in control of his campaign,” Manafort told the Fox News Network Wednesday afternoon. “And I’m in control of doing the things that he wants me to do in the campaign.”

Priebus and the Trump confidants, as well as numerous GOP lawmakers, have been particularly irked by the candidate’s repeated criticism of an American Muslim family whose son, a U.S. Army captain, was killed in Iraq.

I would say in the last couple of weeks, he has been remarkably underperforming and we’ll see whether or not he can take a deep breath and learn these lessons

“I would say in the last couple of weeks, he has been remarkably underperforming and we’ll see whether or not he can take a deep breath and learn these lessons,” said former House Speaker Newt Gingrich on Fox Business News.

Gingrich may join Priebus and another Trump ally, former New York City Mayor Rudy Giuliani, in specifically urging Trump to adjust his approach, according to the Republican official.

Trump on Wednesday dismissed suggestions that the GOP frustration was hurting his campaign.

There is great unity in my campaign, perhaps greater than ever before. I want to thank everyone for your tremendous support. Beat Crooked H! —

Donald J. Trump (@realDonaldTrump) August 03, 2016

Trump wrote on Twitter: “There is great unity in my campaign, perhaps greater than ever before. I want to thank everyone for your tremendous support. Beat Crooked H!” — a reference to Democratic nominee Hillary Clinton.