"There are a lot of areas that have been opened for future witnesses and questioning," said Democrat Senator Richard Blumenthal, "There will be a lot of areas to be pursued."

The White House staunchly defended the June 2016 meeting as appropriate after Trump Jr. released in July the full email chain leading up to the meeting on Twitter upon learning that The Times was going to publish them.

The emails showed that Trump Jr. agreed to meet with the lawyer, Natalia Veselnitskaya, at the Trump Tower in New York to discuss compromising information she said she had on Hillary Clinton.

Veselnitskaya was at the time lobbying for the removal of U.S. sanctions on Russia which had prompted Russian President Vladimir Putin to ban all American adoptions of Russian children in retaliation.

Though the interview was not under oath, lying to the U.S. Congress is still a crime, according to a TheHill news daily report.

Thursday's interview was conducted by the Senate Judiciary Committee staffers. Lawmakers were allowed to observe, but not ask questions.

Trump Jr. is one of the first members of Trump's inner sanctum to come before congressional investigators and the only immediate member of his family to do so. Trump's son-in-law and senior adviser, Jared Kushner, has interviewed previously before the Senate Intelligence Committee.

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