Democrats are looking into President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE’s potential obstruction of former special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE’s probe, including whether the president misled Mueller, as part of the impeachment inquiry, a House Judiciary Committee counsel told a panel of federal circuit court judges on Monday.

House Democrats, who have repeatedly pushed for the urgent release of redacted grand jury materials stemming from Mueller’s probe into Russia’s interference in the 2016 election, made the case for the documents’ continued relevance, even as the impeachment inquiry zeroes in on Trump’s dealings with Ukraine.

In arguments before a panel of appellate judges of the D.C. Circuit Court, House attorney Douglas Letter cited the grand jury testimony of Trump’s former campaign chairman Paul Manafort Paul John ManafortFBI official who worked with Mueller raised doubts about Russia investigation Our Constitution is under attack by Attorney General William Barr Bannon trial date set in alleged border wall scam MORE in particular. Manafort’s statements could shed light on whether written responses Trump provided to the special counsel were untruthful, Letter said.

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Trump told Mueller he didn't recall discussing WikiLeaks with Roger Stone Roger Jason StoneFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. The agony of justice Our Constitution is under attack by Attorney General William Barr MORE, who was convicted of lying to Congress last week.

But during Stone’s trial, Manafort’s deputy Rick Gates Rick GatesFive takeaways on Bannon's indictment Senate intel leaders said Trump associates may have presented misleading testimony during Russia probe: report Top Mueller prosecutor: 'We could have done more' in Russia investigation MORE testified that Trump and Stone had a phone conversation following WikiLeaks' publication of emails stolen from the Democratic National Committee. Afterwards, Trump told Gates that more information was coming, Gates testified.

Letter on Monday doubled down on an argument House Democrats made in a September filing in D.C. District Court that redacted grand jury testimony from Manafort and Gates “have direct bearing on whether the president was untruthful” to the special counsel.

The former special counsel’s 448-page report contains redacted passages detailing information gleaned during grand jury proceedings. The House Judiciary Committee is seeking a judicial order to lift the redactions.

The D.C. Circuit Court last month granted the Justice Department’s request to temporarily block the release of grand jury materials while the case plays out in court.

Updated at 1:44 p.m.