House Judiciary Committee Chairman Jerrold Nadler Jerrold (Jerry) Lewis NadlerDemocrats shoot down talk of expanding Supreme Court Schumer: 'Nothing is off the table' if GOP moves forward with Ginsburg replacement Top Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence MORE (D-N.Y.) said Wednesday that the House panel will go to court this week to obtain requested grand jury material connected to 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 Russia probe and to enforce a subpoena seeking the testimony of former White House counsel Don McGahn.

“The very next step, either tomorrow or Friday, is we’re going into court to ask for the grand jury material and to enforce the subpoena against Mr. McGahn,” Nadler said.

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“That’s particularly important because the excuses ... that the White House gives for McGahn not testifying ... are the same excuses for all the other fact witnesses, and if we break that, we’ll break the logjam,” he continued.

McGahn was subpoenaed by the House Judiciary Committee earlier this year to answer questions about Mueller's Russia probe before the House panel. However, President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE instructed McGahn to reject the subpoena in May, pointing to a Justice Department legal opinion that argued the former official was immune from giving congressional testimony.

During Mueller’s sweeping two-year investigation, McGahn alleged to investigators that the president, on multiple occasions, instructed him to have the former special counsel fired, citing conflicts of interest.

Trump has disputed McGahn’s account several times, saying last month that he “was never going to fire Mueller” and never even “suggested firing” him.

"I don't care what [McGahn] says, it doesn't matter," Trump said at the time.

McGahn is just one of a number of former Trump administration officials from whom the committee is seeking testimony as part of the probe. The committee has already issued subpoenas for testimony from former communications director Hope Hicks Hope Charlotte HicksSenate intel leaders said Trump associates may have presented misleading testimony during Russia probe: report Cuomo turned down Trump invitation to participate in April press briefing: report Trump shakes up White House communications team MORE, Trump senior adviser and son-in-law Jared Kushner Jared Corey KushnerAbraham Accords: New hope for peace in Middle East Tenants in Kushner building file lawsuit alleging dangerous living conditions Trump hosts Israel, UAE, Bahrain for historic signing MORE and former national security adviser Michael Flynn.