The chief spokesman for President Trump’s personal legal team, Mark Corallo, has resigned.

Corallo confirmed his resignation in an email to The Hill.

Politico reported Thursday that his resignation was due to growing frustration with operation and warring factions, as well as concerns over whether he was being told the truth.

Corallo, a veteran GOP operative, was working on the White House defense against special counsel Robert Meuller's probe into Russian interference in the 2016 presidential election.

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According to reports, Corallo had never met Trump or Trump's attorney, Marc Kasowitz, before taking the job defending the president.

Last month, The New York Times reported that Corallo had previously used Twitter to criticize the president and his administration.

“Hey Mr. President, where's all the ‘winning?’” Corallo tweeted last month, appearing to reference former President Bill Clinton.

He also used Twitter to criticize Trump’s reliance on son-in-law and senior White House adviser Jared Kushner, calling Kushner part of the “swamp” Trump promised to drain.

Corallo’s message also split from that of many other Trump allies, who were critical of Mueller.

Days before he accepted the role as Kasowitz's spokesman, he praised Mueller for his integrity and honor.

Updated Friday at 7:45 a.m. Niall Stanage contributed.