WASHINGTON — An August 2016 meeting between President Donald Trump’s former campaign chairman and an associate with ties to Russian intelligence goes to the “heart” of the Russia investigation, according to a court transcript unsealed Thursday.

The transcript from a sealed hearing in Paul Manafort’s case provides further insight into what special counsel Robert Mueller considers significant in his wide-ranging probe of the Kremlin’s efforts to sway the 2016 presidential election and the ties between Trump associates and Russia. It makes clear that prosecutors have honed in on the repeated contacts between Manafort and his longtime associate, Konstantin Kilimnik, who the FBI says has ties to the Russia’s military intelligence agency.

Still, it’s unclear what specifically has piqued prosecutors’ interests and whether it has any direct connection to any conspiracy related to election interference. The transcript of the hearing, which took place Monday, was released by court order Thursday but much of it was redacted to protect the ongoing investigation including several key portions about Manafort and Kilimnik.

According to the transcript, prosecutor Andrew Weissmann said the substance of the meeting, which took place in New York just weeks after the Republican National Convention, goes to the “larger view of what we think is going on” and what “we think the motive here is.”

“This goes, I think, very much to the heart of what the Special Counsel’s Office is investigating,” Weissmann said, noting Kilimnik’s past intelligence ties and Manafort’s position at the top of the Trump campaign at the time. “That meeting and what happened at that meeting is of significance to the special counsel,” he added later.

Previously, Manafort’s attorneys accidentally revealed that among topics discussed by Manafort and Kilimnik during the election was a possible peace plan to resolve the Russia-Ukraine conflict in Crimea. They also disclosed that Manafort had shared polling data on the Trump campaign with Kilimnik. But it’s unclear if Weissmann was referencing those topics in his comments Monday.

The transcript does reveal that Rick Gates, Manafort’s longtime protege who also served on the Trump campaign, attended the meeting. And prosecutors say Manafort and Gates took steps to conceal that they met with Kiliminik by taking the “precaution” of leaving separately. Gates also spoke to investigators about Manafort sharing the polling data, according to the transcript.

The documents also shows that prosecutors remain interested in Manafort’s work after the campaign, including meetings he had with Kilimnik around Trump’s presidential inauguration and political work he performed for an unnamed Ukrainian.

Those details were explored in Monday’s hearing because they are one of several topics that Mueller’s team says he lied about during interviews with investigators after he cut a plea deal. Manafort has denied intentionally making false statements.

U.S. District Judge Amy Berman Jackson is now tasked with deciding whether Manafort’s statements constituted a breach of his plea agreement. A second sealed hearing on the matter is set for next week.

Jackson’s ruling could affect Manafort’s sentencing on two felony charges stemming from illegal lobbying on behalf of Ukrainian interest. Manafort faces a separate sentencing in Virginia on tax and fraud charges. In that case, Manafort faces the possibility of a decade in prison.

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Associated Press writer Eric Tucker contributed to this report.

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