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 in an interview broadcast Sunday said that appointing Jeff Sessions Jefferson (Jeff) Beauregard SessionsRoy Moore sues Alabama over COVID-19 restrictions GOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs MORE as his first attorney general was his “biggest mistake” in the Oval Office.

“I would say if I had one do-over, it would be I would not have appointed Jeff Sessions to be attorney general,” Trump said on NBC’s “Meet the Press.” “That was the biggest mistake.”

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Sessions was a top 2016 campaign surrogate for Trump and the first senator to endorse him, but their relationship soured after Sessions recused himself from the investigation into Russia's election interference in 2016, leading then-Deputy Attorney General Rod Rosenstein Rod RosensteinDOJ kept investigators from completing probe of Trump ties to Russia: report Five takeaways from final Senate Intel Russia report FBI officials hid copies of Russia probe documents fearing Trump interference: book MORE to appoint special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE.

Mueller’s report details several occasions in which Trump pressured Sessions to reverse his recusal.

Trump went on to tweet and make public comments indicating he never would have appointed Sessions had he known he would recuse himself.

Sessions resigned as attorney general in November 2018, a day after the midterm elections.