Fox News's Geraldo Rivera said Tuesday that President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE’s latest attack against former White House aide Omarosa Manigault Newman is beneath the "dignity" of his office.

“Fear my friend [Trump] undermines himself by using intemperate, boorish language to describe his enemies,” Rivera said on Twitter.

“I can't stand [Omarosa] a bully, back stabber & big mouth,” Rivera added. “But to call her a 'dog' & 'low life' is beneath dignity of the office of [POTUS] & open to ugly connotation.”

Fear my friend @realDonaldTrump undermines himself by using intemperate, boorish language to describe his enemies. I can't stand @OMAROSA a bully, back stabber & big mouth. But to call her a 'dog' & 'low life' is beneath dignity of the office of @POTUS & open to ugly connotation. — Geraldo Rivera (@GeraldoRivera) August 14, 2018

The Fox News host has generally been a strong supporter of the president but has criticized him in the past over family separations prompted by his controversial “zero tolerance” immigration policy and for decrying immigration from "shithole countries.”

He tweeted the critical remark after Trump took to Twitter to slam Manigault Newman, who was once the highest-ranking African-American woman in the West Wing, following her release of a series of secretly recorded tapes from her time in the White House and on the campaign trail.

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"When you give a crazed, crying lowlife a break, and give her a job at the White House, I guess it just didn’t work out. Good work by General Kelly for quickly firing that dog!" Trump said on Twitter, referring to White House chief of staff John Kelly John Francis KellyMORE.

Trump's remark came the same morning CBS News released a recording in which Manigault Newman appears to discuss with Trump campaign aides how to handle the potential fallout from an alleged tape on which she claims he used the N-word on the set of "The Apprentice.”

While it is unclear during the call if Manigault Newman had heard the tape, parts of the discussion suggest that Trump acknowledged using the racial slur.

The new recording comes as Manigault Newman as she continues to promote her new tell-all book, "Unhinged: An Insider's Account of the Trump White House."