President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE on Sunday blasted the FBI and Department of Justice for not telling him that agents were “secretly investigating" his former campaign chairman, Paul Manafort Paul John ManafortOur Constitution is under attack by Attorney General William Barr Bannon trial date set in alleged border wall scam Conspicuous by their absence from the Republican Convention MORE, during the 2016 election.

“As only one of two people left who could become President, why wouldn’t the FBI or Department of 'Justice' have told me that they were secretly investigating Paul Manafort (on charges that were 10 years old and had been previously dropped) during my campaign?” Trump asked in a tweet.

He added that Manafort “came into the campaign very late and was with us for a short period of time,” but said the campaign “should have been told that Comey and the boys were doing a number on him, and he wouldn’t have been hired!”

As only one of two people left who could become President, why wouldn’t the FBI or Department of “Justice” have told me that they were secretly investigating Paul Manafort (on charges that were 10 years old and had been previously dropped) during my campaign? Should have told me! — Donald J. Trump (@realDonaldTrump) June 3, 2018

....Paul Manafort came into the campaign very late and was with us for a short period of time (he represented Ronald Reagan, Bob Dole & many others over the years), but we should have been told that Comey and the boys were doing a number on him, and he wouldn’t have been hired! — Donald J. Trump (@realDonaldTrump) June 3, 2018

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Trump named Manafort head of his campaign in May 2016, but the businessman stepped down in August of that year after media reports of his dealings with the Ukrainian government emerged.

CNN reported last year that Manafort had been under FBI surveillance before and after the 2016 election. He reportedly became the central subject of a probe that began in 2014.

Manafort faces several charges as a result of 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's investigation, including tax fraud, bank fraud and money laundering. The charges largely relate to his work for Ukrainian politicians.

Manafort has pleaded not guilty to the charges. His business associate and former Trump campaign staffer Richard Gates reached a plea deal with Mueller’s team and has agreed to cooperate with the special counsel.