Former U.S. attorney Harry Litman said he expects President TrumpDonald John TrumpGOP divided over impeachment trial strategy Official testifies that Bolton had 'one-on-one meeting' with Trump over Ukraine aid Louisiana governor wins re-election MORE's former campaign chairman, Paul ManafortPaul John ManafortGates sentencing set for next month Yovanovitch says John Solomon's columns were used to push false allegations Trump bemoans 'double standard' in Stone conviction MORE, to be sent to federal prison by the end of the week.

“Prosecutors hate this, judges hate this, and he’s going to have to bring his toothbrush to court on Friday because the statute says, if they find this happened, there’s a presumption that no circumstances exist that will get him safely there for trial,” Litman said Tuesday on MSNBC.

“So there’s the real prospect that he now goes to jail, never to leave even until the end of his sentence,” he said. 

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Litman's comments came days after special counsel Robert MuellerRobert (Bob) Swan MuellerSpeier says impeachment inquiry shows 'very strong case of bribery' by Trump Gowdy: I '100 percent' still believe public congressional hearings are 'a circus' Comey: Mueller 'didn't succeed in his mission because there was inadequate transparency' MORE said in a court filing that Manafort attempted to tamper with potential witnesses while on pretrial release. Mueller on Monday asked the court to revoke or revise his release conditions in response to the court filing.

Litman, who now lectures at the University of California Los Angeles School of Law, condemned Manafort's alleged actions on Tuesday.

"This is the stupidest thing that a defendant can do, this sort of witness tampering,” he told MSNBC. “He’s looking at being in prison, which is a very sort of focusing event, by Friday,” Litman continued. 

Last month marked the first anniversary of the start of Mueller’s investigation into Russian meddling in the 2016 presidential election and his probe into possible collusion between the Trump campaign and Moscow.

The special counsel hit Manafort with a 12-count indictment last year, which included conspiracy against the United States, tax fraud and money laundering.

Manafort has pleaded not guilty to the charges, which have no direct relation to his work for the Trump campaign.