The judge presiding over 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’s criminal trial has granted a request by 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 to seal portions of a sidebar conversation between the judge and attorneys during Richard Gates’s testimony this week.

“Sealing a limited portion of the sidebar conference is necessary because it would reveal substantive evidence pertaining to an ongoing government investigation,” Mueller’s team wrote in the motion to seal portions of the transcript on Thursday.

U.S. District Judge T.S. Ellis granted the request, sealing the requested portions of the conversation “until the relevant aspect of the investigation is revealed publicly, if that were to occur.”

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CNN reported Thursday that the filing referred to a conversation between trial attorneys and the judge after Manafort attorney Kevin Downing asked Gates, "Were you interviewed on several occasions about your time at the Trump campaign?"

Prosecutor Greg Andres objected to the question before Gates replied, and the attorneys huddled with Ellis, a Reagan appointee, out of earshot of Gates, the jury and trial attendees, according to CNN.

Gates, Manafort’s longtime business associate, has pleaded guilty to charges brought against him by Mueller and is participating with the special counsel’s investigation into possible collusion between 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’s 2016 campaign and Russia.

Manafort is facing another trial in Washington, D.C., later this year on other charges brought against him by Mueller, including obstructing justice, conspiracy to obstruct justice and illegal foreign lobbying.

Both Gates and Manafort worked on Trump’s 2016 campaign. The charges brought against Manafort in his ongoing Alexandria, Va., trial are unrelated to his time as head of the Trump campaign.

Gates testified this week that he and Manafort committed crimes together.

Manafort has pleaded not guilty to charges in both cases.