The lawyer, Natalia Veselnitskaya, also admitted she's an informant to the Russian attorney general, during an NBC News interview that's slated to air Friday, according to the New York Times. Specifically, Veselnitskaya said she has been "actively communicating" with the office of Yuri Chaika, the Russian prosecutor general and a top Kremlin official, since 2013.
"I am a lawyer, and I am an informant", she told NBC News, according to a New York Times report.
Dossier published screen shots of what it said were emails about the case between Veselnitskaya and Sergei Bochkarev, head of the criminal investigation division of the prosecutor-general's office.
It's always been reported that Veselnitskaya - who now claims her emails were hacked, according to her Wednesday interview with Russian news outlet Interfax - wasn't meeting with the Trump campaign to discuss policies surrounding Russian adoption, as the White House previously claimed.
The emails appear to show a correspondence between Veselnitskaya and an official in Russia's state prosecutor's office coordinating a response to a case brought forward by the U.S. Department of Justice, NBC's Richard Engel said on MSNBC.
E-mails later released by Donald Trump Jr. showed that the meeting was organized by a British music promoter with Russian business ties, Rob Goldstone. The encounter took place after Donald Trump Jr. was told she had potentially incriminating information about Trump's election opponent, Hillary Clinton.
Veseltnitskaya could not immediately be reached for comment, but in remarks to the Interfax news agency, she said that her e-mail accounts had been hacked in February.
But the e-mails, which were provided to RFE/RL, show her communicating with Sergei Bochkaryov, a top official in the office of Prosecutor-General Yury Chaika, about an official government response to a USA legal request.
Special counsel Robert S. Mueller III's Russian Federation investigation has reportedly focused on the June 2016 meeting at Trump Tower in Manhattan and alternating narratives related to the sit-down.
Khodorkovsky spent a decade in prison on fraud and tax-evasion convictions.
Donald Trump Jr. met with Veselnitskaya in hopes of receiving dirt on Hillary Clinton. In November, Veselnitskaya told the Senate Judiciary Committee that she had "no relationship with Mr. Chaikia, his representatives and his institutions other than those related to my professional functions as a lawyer".
Mueller is investigating Russia's interference and possible collusion with the Trump campaign in the 2016 presidential election.