(CNN) A Democratic member of the Senate Judiciary Committee says a Russian-American lobbyist ought to testify, after it emerged that he was one of at least eight people who met with Donald Trump Jr., Jared Kushner and Paul Manafort at Trump Tower in June 2016.

During an interview on CNN's "OutFront" Friday night, Sen. Richard Blumenthal told Kate Bolduan that the lobbyist, Rinat Akhmetshin, should be called before the Judiciary Committee to give his account of the meeting.

"He is relevant because his specialty as a Russian lobbyist was, in fact, lifting sanctions, and arguably that was Vladimir Putin's main objective in possibly offering dirt on Hillary Clinton," Blumenthal said.

Trump Jr. had previously said that Jared Kushner, Paul Manafort and music publicist Rob Goldstone were present at his meeting with Russian lawyer Natalia Veselnitskaya. The Associated Press reported on Friday that Akhmetshin also attended

A source familiar with the circumstances told CNN there were at least two other people in the room as well: a translator and a representative of the Russian family who had asked Goldstone to set up the meeting. The source did not provide the names.

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