The family of GOP mega-donor Robert Mercer reportedly cut off funding for former White House strategist Stephen Bannon's private security detail amid frustrations over his comments about his possible political ambitions.

An associate of the Mercer family, which has been a steady supporter of Bannon and his political efforts, told The New York Times that they cut the funding for the personal protective detail. The associate said the Mercers were upset after learning that Bannon had privately said that they would support him if he ran for president.

The revelation comes after a rare statement Thursday from Rebekah Mercer, Robert Mercer's daughter, publicly rebuking Bannon while siding with President Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE amid his feud with the former White House strategist.

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An excerpt from author Michael Wolff's new book "Fire and Fury: Inside the Trump White House" quoted Bannon spurning Trump administration officials and campaign associates, igniting Trump's anger and prompting the White House to blast the book and its reported details.

Bannon reportedly called an infamous 2016 Trump Tower meeting involving Trump's oldest son Donald Trump Jr. Don John Trump'Tiger King' star Joe Exotic requests pardon from Trump: 'Be my hero please' Zaid Jilani discusses Trump's move to cancel racial sensitivity training at federal agencies Trump International Hotel in Vancouver closes permanently MORE and a Russian lawyer promising damaging information on Hillary Clinton Hillary Diane Rodham ClintonHillicon Valley: FBI chief says Russia is trying to interfere in election to undermine Biden | Treasury Dept. sanctions Iranian government-backed hackers The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters FBI chief says Russia is trying to interfere in election to undermine Biden MORE "treasonous." President Trump later claimed that Bannon had "lost his mind."

"I support President Trump and the platform upon which he was elected," Rebekah Mercer said in a statement Thursday reported by The Washington Post.

"My family and I have not communicated with Steve Bannon Stephen (Steve) Kevin BannonJuan Williams: Swamp creature at the White House Engineers say privately funded border wall is poorly constructed and set to fail: report Bannon and Maxwell cases display DOJ press strategy chutzpah MORE in many months and have provided no financial support to his political agenda, nor do we support his recent actions and statements," Mercer added.

Robert Mercer, who sold stock in Bannon's website Breitbart News to his daughter, has previously expressed his political differences with Bannon.