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 suggested on Wednesday that 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, has been treated worse than notorious gangster Al Capone.

"Looking back on history, who was treated worse, Alfonse Capone, legendary mob boss, killer and 'Public Enemy Number One,' or Paul Manafort, political operative & Reagan/Dole darling, now serving solitary confinement - although convicted of nothing? Where is the Russian Collusion?" Trump tweeted.

Looking back on history, who was treated worse, Alfonse Capone, legendary mob boss, killer and “Public Enemy Number One,” or Paul Manafort, political operative & Reagan/Dole darling, now serving solitary confinement - although convicted of nothing? Where is the Russian Collusion? — Donald J. Trump (@realDonaldTrump) August 1, 2018

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Manafort, a longtime Republican operative, is currently on trial for charges of tax and bank fraud in Alexandria, Va.

Those charges were brought as the 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 into possible collusion between the Trump campaign and Russia, but are unrelated to his work during the 2016 presidential race.

Manafort's lawyers have said their client had been kept in solitary confinement in a Virginia jail as he awaited the start of his trial, because of concerns about his safety.

Manafort was sent to jail in June after a judge revoked his house arrest amid allegations of witness tampering. He faces separate federal charges in Washington, D.C.

Trump in a tweet earlier Wednesday asked why he was not informed that Manafort was under investigation.

"Paul Manafort worked for Ronald Reagan, Bob Dole and many other highly prominent and respected political leaders. He worked for me for a very short time," the president wrote. "Why didn’t government tell me that he was under investigation. These old charges have nothing to do with Collusion - a Hoax!"

Paul Manafort worked for Ronald Reagan, Bob Dole and many other highly prominent and respected political leaders. He worked for me for a very short time. Why didn’t government tell me that he was under investigation. These old charges have nothing to do with Collusion - a Hoax! — Donald J. Trump (@realDonaldTrump) August 1, 2018

Trump has often labeled Mueller's Russia investigation a "hoax," and in a third tweet Wednesday also called in a "disgrace."

"Russian Collusion with the Trump Campaign, one of the most successful in history, is a TOTAL HOAX. The Democrats paid for the phony and discredited Dossier which was, along with Comey, McCabe, Strzok and his lover, the lovely Lisa Page, used to begin the Witch Hunt. Disgraceful!" he wrote.