"I am a lawyer, and I am an informant", she reportedly told NBC.
Veselnitskaya has denied connections to the Russian government since her meeting with then-candidate Donald Trump's son, son-in-law Jared Kushner and campaign chairman Paul Manafort surfaced during the investigation of Moscow's meddling in the 2016 presidential election.
Natalia Veselnitskaya, a Russian lawyer who met with top members of the Trump campaign team in June of 2016, has admitted to funneling information to the Kremlin starting in 2013.
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. "Since 2013, I have been actively communicating with the office of the Russian prosecutor general".
In the interview, Veselnitskaya confirmed the emails were written by her, the Times reported, saying "many things included here are from my documents, my personal documents".
Veselnitskaya said she was working for Yuri Chaika at the time of the meeting, the prosecutor general of Russian Federation and a "top Kremlin official". The meeting, one focus of the special counsel investigation into Russia's election interference, was organized after an intermediary promised that Ms. Veselnitskaya would deliver documents that would incriminate Mrs. Clinton.
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The Times reported that Natalia Veselnitskaya detailed in an interview with NBC News, set to air Friday, her previously undisclosed relationship with Yuri Chaika, Russia's prosecutor general.
Donald Trump Jr. has said the meeting with Veselnitskaya did not result in the damaging information he was hoping for.
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.
Khodorkovsky spent a decade in prison on fraud and tax-evasion convictions.
"I shared information with" Chaika, she told the newspaper, in the course of her investigation into a hedge-fund manager who was a driving force behind the Magnitsky Act, a US sanctions law that locked certain Russians out of their overseas funds, among other punishments.
Trump Jr. has said the meeting was unproductive and that instead of providing dirt on Clinton, Veselnitskaya tried to lobby the Trump campaign on repealing 2012 sanctions. "I have no relationship with Mr. Chaika, his representatives and his institutions other than those related to my professional functions as a lawyer".