Robert Mueller, the newly appointed special counselor in the Russia investigation, has reportedly been briefed on the memos former FBI Director James Comey used to document his private conversations with President Trump, CNN reports.

The New York Times broke the news last week that Trump reportedly asked Comey to let “go” of his agency’s investigation into former national security adviser Michael Flynn.

One memo Mueller reviewed confirms the Flynn report, a person familiar with the matter told the news outlet.

Comey reportedly maintained a paper trail to document what he viewed as improper attempts by the president to influence the investigation.

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Mueller also recently met with counterintelligence agents at FBI headquarters who have been working on the probe since last July, two people familiar with the situation told CNN.

Trump fired Comey earlier this year as his agency continued to investigate whether Trump campaign officials colluded with the Russians in an effort to sway the election, a move that has raised questions about timing and Trump's motives.

Mueller will focus part of his investigation on possible obstruction of justice, a source familiar with the matter told CNN.

If there appears to be an obstruction of justice case, Comey will likely be interviewed by Mueller as a witness.

Comey's agreement to testify in front of the congressional intelligence committees will likely complicate Mueller's probe and will limit what the former director can publicly disclose.

"There's no way in the world Mueller wants his witness testifying," the source told CNN. "He wants to question him before anyone else does but before that he'll have to go through tons of documents."

House Oversight Committee Chairman Jason Chaffetz Jason ChaffetzThe myth of the conservative bestseller Elijah Cummings, Democratic chairman and powerful Trump critic, dies at 68 House Oversight panel demands DeVos turn over personal email records MORE (R-Utah) tweeted Monday that Comey's testimony in front of his committee has been postponed until Comey talks with Mueller.