Democrats on the House Judiciary Committee are reportedly seeking testimony from former Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsRoy Moore sues Alabama over COVID-19 restrictions GOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs MORE as part of their impeachment probe involving 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.

The Washington Post reported Friday that Democrats would like to ask the former attorney general about his rocky relationship with the president, including pushback over Sessions's decision to recuse himself from the federal Russia probe, a move that long frustrated Trump.

Officials familiar with the discussions told the newspaper that congressional aides for the Judiciary panel contacted Charles Cooper, an attorney for Sessions, over the summer, though Cooper said Sessions would only appear under the force of a subpoena.

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“I have made clear that Attorney General Sessions will not appear except under compulsion of a congressional subpoena,” he told the Post.

A subpoena for Sessions has yet to be issued.

The Hill has reached out to the Judiciary Committee for comment.

The panel this summer approved several compulsory measures for Trump associates and other former administration officials as they investigate various aspects of the Trump administration.

Democrats pushing to secure Sessions's testimony view him as a key player in episodes of possible obstruction of justice laid out by 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.

Trump requested Sessions's resignation in November 2018 after publicly lambasting his attorney general for months over Sessions's decision to recuse himself in the probe into the Trump campaign and Russian efforts to meddle in the 2016 election.

After Sessions recused himself in March 2017, then-Deputy Attorney General Rod Rosenstein Rod RosensteinDOJ kept investigators from completing probe of Trump ties to Russia: report Five takeaways from final Senate Intel Russia report FBI officials hid copies of Russia probe documents fearing Trump interference: book MORE became the highest-ranking Justice Department official overseeing the Russia probe. Rosenstein later appointed Mueller to lead the investigation after Trump fired then-FBI Director James Comey James Brien ComeySteele Dossier sub-source was subject of FBI counterintelligence probe Judge will not dismiss McCabe's case against DOJ Democrats fear Russia interference could spoil bid to retake Senate MORE.

Mueller's special counsel investigation led to indictments of several Trump associates and hung over his administration for its first two years.

Democrats would likely ask Sessions about any blowback he received from the president over his recusal and any additional knowledge he may have of the episodes of potential obstruction laid out in Mueller’s report.

The Post noted that the White House could try to block his testimony, as it has with several other current and former officials.

The news of Democrats’ efforts to obtain testimony from Sessions comes after the judiciary panel voted to expand its powers to investigate Trump while it mulls launching formal impeachment proceedings.