Donald Trump Jr. on Wednesday declined to tell the House Intelligence Committee details about his conversation with President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE regarding his meeting with a Russian lawyer, citing client privilege, according to the committee's top Democrat.

Rep. Adam Schiff Adam Bennett SchiffChris Matthews ripped for complimenting Trump's 'true presidential behavior' on Ginsburg Trump casts doubt on Ginsburg statement, wonders if it was written by Schiff, Pelosi or Schumer Top Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence MORE (D-Calif.) is challenging Trump Jr.'s reasoning, saying Trump Jr. cannot apply attorney-client privilege and "shield" lawmakers from his conversation between father and son just because an attorney was present in the room at the time.

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"He acknowledged having discussed the June 9 meeting and the emails that went into establishing that meeting after those emails became public," Schiff said Wednesday following a closed-door meeting with Trump Jr.

"He acknowledged discussing that matter with his father, but refused to answer questions about that discussion along the basis of a attorney-client privilege. In my view there is no attorney-client privilege that protects a discussion between father and son," Schiff continued.

The California lawmaker said the details of such a discussion could reveal critical information, including efforts to "obstruct the investigation into the campaign's contact with the Russians or any other misrepresentations to the public about that meeting."

His remarks come after Trump Jr. appeared voluntarily before the House Intelligence Committee for a grueling closed-door interview that lasted eight hours while the panel peppered the president's eldest son with questions about his Russian contacts.

Trump Jr. told lawmakers he discussed the 2016 Trump Tower meeting with his father last summer, after emails setting up the meeting with a Russian lawyer became public. The meeting, with the Russian lawyer Natalia Veselnitskaya, is one prong of the probe into possible collusion between Moscow and the Trump campaign. Veselnitskaya has a record fighting for Kremlin-backed issues.

Trump Jr. frustrated panel Democrats by refusing to answer questions related to the controversial meeting, however, the Republican lawmaker leading the Russia investigation, Rep. Mike Conaway Kenneth (Mike) Michael ConawayBottom line House Republican introduces amendment to include farm aid in stopgap funding bill Live coverage: Democrats, Republicans seek to win PR battle in final House impeachment hearing MORE (R-Texas), maintained that Trump Jr. had answered "all" his questions. Other GOP lawmakers on the panel echoed that Trump Jr. cooperated with their questioning.

Democrats on the committee have repeatedly complained after panel interviews that the majority, who unilaterally have the power to issue subpoenas, have failed to press witnesses into answering questions that they want answered.

Trump Jr.'s appearance before the intelligence panel is his second interview on Capitol Hill and the latest interview of a member of the president's trusted inner circle.

CNN reported that Trump Jr., in his testimony, said he did not directly speak with his father about his initial, misleading statement about the Trump Tower meeting in June 2016 with Veselnitskaya.

He instead talked to top White House aide Hope Hicks about crafting the statement that misleadingly claimed the Trump Jr. and Veselnitskaya only talked about adoption, rather than campaign-related issues. Hicks then spoke with the president before the statement was released, according to CNN.

White House press secretary Sarah Huckabee Sanders in August nodded to the president's involvement in drafting the statement, saying he weighed in "as any father would." Other Trump aides denied a Washington Post report that Trump "dictated" the statement to his son aboard Air Force One.

Trump Jr.'s statement on the meeting continued to evolve after the initial statement and he acknowledged in a statement before the Senate Judiciary Committee in September that he met with Veselnitskaya to discuss the "fitness" of Hillary Clinton Hillary Diane Rodham ClintonButtigieg stands in as Pence for Harris's debate practice Senate GOP sees early Supreme Court vote as political booster shot Poll: 51 percent of voters want to abolish the electoral college MORE as a presidential candidate after an associate promised him incriminating information on his father's opponent.