Special counsel investigators are requesting information about an as-yet unidentified person who attended a meeting between members of President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE's campaign and a Russian lawyer, CNN reported Tuesday.

The person's attorney, Scott Balber, told the network that his client's identity is known to prosecutors and that the person is "cooperating fully" with investigators.

"The eighth person has been identified by prosecutors, and we are cooperating fully with prosecutors as a result of the investigation," Balber told CNN. "To preserve the integrity of the investigation, we are declining to identify him at this time."

ADVERTISEMENT

He said his client has not yet been interviewed.

Trump's eldest son, Donald Trump Jr.; then-Trump campaign chairman Paul Manafort; and the president's son-in-law, Jared Kushner, met last summer with Russian lawyer Natalia Veselnitskaya, who had promised compromising information about Democratic nominee Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE.

Publicist and intermediary Rob Goldstone also attended the meeting, as did Russian-American lobbyist Rinat Akhmetshin and an interpreter.

The eighth person has yet to be publicly identified, though Balber told CNN that the person is a U.S. citizen who speaks fluent Russian and does not have ties to the Russian government.

The person is reportedly a representative of Emin Agalarov, a Russian-Azerbaijani pop star, and his father, Russian real estate developer Aras Agalarov, both of whom have done business with Trump.

Balber also represents the Agalarovs.

The unidentified person attended the meeting with the Trump campaign members with the idea that he would act as an interpreter for Veselnitskaya, but learned when he arrived at the meeting that she had her own interpreter, according to CNN.