Sen. Jeff Flake Jeffrey (Jeff) Lane FlakeHow fast population growth made Arizona a swing state Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Republican former Michigan governor says he's voting for Biden MORE (R-Ariz.) said Tuesday that Republicans should not be “okay" with 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 referring to former White House aide Omarosa Manigault Newman Omarosa Onee Manigault NewmanTrump hurls insults at Harris, Ocasio-Cortez and other women Pelosi makes fans as Democrat who gets under Trump's skin The Memo: Impeachment's scars cut deep with Trump, say those who know him MORE as a "dog."

“This kind of language is unbecoming of a President of the United States,” Flake, a frequent critic of the president who is retiring at the end of this Congress, said on Twitter in reference to an earlier tweet from Trump.

“There is no excuse for it, and Republicans should not be okay with it,” Flake continued.

This kind of language is unbecoming of a President of the United States. There is no excuse for it, and Republicans should not be okay with it. https://t.co/0TLmRT7y22 — Jeff Flake (@JeffFlake) August 14, 2018

Trump took to Twitter Tuesday morning to slam Manigault Newman, who was once the highest-ranking African-American woman in the West Wing, after she released a series of secretly recorded tapes from her time in the White House.

"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.

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The president’s remark came the same morning CBS News released a recording in which Manigault Newman appears to discuss with Trump aides how to handle the potential fallout from an alleged tape in which she claims Trump used the N-word.

The recording appears to be of an internal call during Trump's 2016 campaign about the alleged tape, which Manigault Newman claims was created during Trump's time as host of "The Apprentice.”

While it is unclear from the call if Manigault Newman or the Trump aides heard the alleged tape, parts of the discussion suggest that he acknowledged using the racial slur.

The latest recording arrives as the former White House aide promotes a new memoir, "Unhinged: An Insider's Account of the Trump White House."