Representative Adam Schiff, the committee's top Democrat, said that Trump Jr. told the committee he couldn't speak about the conversations with his father because of "attorney-client privilege".
After the committee completed its interview with Trump Jr., Schiff briefly spoke with reporters and revealed that Trump Jr. acknowledged that he discussed the June 2016 meeting, as well as the emails leading up to the meeting, with his father.
President Trump has repeatedly denied knowing about the meeting, which included his son, Mr. Trump's son-in-law Jared Kushner, and former Trump campaign chairman Paul Manafort, until it was reported last summer.
Despite the White House denials, Russian Federation probe investigators have pushed hard to learn all possible details about exactly what Mr. Trump knew about the Veselnitskaya meeting.
But the White House has admitted that President Trump was involved in drafting a public statement reacting to the news when it broke.
Trump Jr.'s attorney asked "for more time to deliberate" on whether to share additional information, and Schiff said Democrats will follow up on their request for details about what the Trumps discussed.
In August, White House press secretary Sarah Huckabee Sanders said the president weighed in on the statement "as any father would".
Natalia Veselnitskaya, the Kremlin-linked lawyer Trump Jr. met, contradicted the president's response in a letter answering questions from the Senate Judiciary Committee released Wednesday.
The interview is being held behind closed doors, and Trump Jr. arrived out of sight of cameras through a back entrance. It was then that Trump Jr., per the sources, said Clinton's testimony was not the same: she was testifying about the 2012 attack in Benghazi where four Americans were killed.
"In my view, there is no attorney-client privilege that protects a discussion between father and son", Schiff said.
His Wednesday session with the House committee was longer and more expansive, and it was the first opportunity elected lawmakers have had to ask Trump Jr. questions directly, instead of leaving that to investigative staff. The Trump Tower assembly is a situation of eager scrutiny to special counsel Robert Mueller, who is also probing the interference and if there was any hindrance o justification. And whatever was said between father and son after emails concerning the meeting became public would certainly be relevant to understanding the role the president might have played in orchestrating the response to the damaging reports about Trump Jr.'s effort to obtain Clinton "dirt".