The judge presiding over former national security adviser Michael Flynn’s case on Thursday ordered federal prosecutors to release transcripts of the Flynn’s conversations with Russian officials.

District Judge Emmet Sullivan also ordered the release of a transcript of a voicemail left for Flynn that purportedly “could have affected both his willingness to cooperate and the completeness of that cooperation," according to one court document.

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That voicemail apparently refers to a message left for Flynn’s attorneys by one of President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE’s personal attorneys, reminding Flynn of the president’s “warm feelings” for him after the former administration official started cooperating with 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.

Sullivan additionally ordered that federal prosecutors also make public parts of the redacted Mueller report that relate to Flynn.

The judge, a Clinton appointee, gave the Department of Justice a May 31 deadline for all of those documents.

The release of the previously hidden documents would disclose even further details into Flynn’s own contacts with Russians and what Mueller found during the course of his investigation.

The judge has similarly ordered he be given the audio of the voicemail in question, as well as that of calls between Flynn and Russians, opening the door for Sullivan to publicly release them.

Flynn has pleaded guilty to making a false statement to the FBI about his contact with the Russian ambassador. He has not yet been sentenced and has been cooperating with federal investigators since his December 2017 plea.

Sullivan’s order came shortly after prosecutors agreed to unseal some documents in Flynn’s case, revealing more details about his cooperation with the special counsel's investigation.

The records show that Flynn provided information on both Mueller’s inquiry into whether Trump obstructed justice and his probe into Russian interference in the 2016 election.