Jeffrey Clark, a former Justice Department lawyer who positioned himself as an ally of President Donald Trump was issued a subpoena on Wednesday by the House committee investigating the January 6 riot at the US Capitol. Clark also aided Trump’s efforts to challenge the results of the presidential election.

The committee on Wednesday said it has demanded documents and testimony from Clark, a former assistant attorney general who lent a sympathetic ear to the president’s baseless claims that the election results were fraudulent. Clark clashed with superiors during the tumultuous final weeks of the Trump administration, including during a dramatic White House meeting, the Associated Press reported.

The subpoena comes one week after the release of a Senate Judiciary Committee report that documented extraordinary tensions within the senior ranks of the Justice Department in December and January as Trump and allies prodded the law enforcement agency to aid in efforts to undo the election won by Joe Biden.

William Barr, the attorney general during the time of the Trump administration, had said that the Justice Department found no evidence of widespread fraud that could have overturned the results. Unsubstantiated claims of fraud have been repeatedly rejected by many judges, including those appointed by Trump himself. Election officials across the country have also rejected the claim.

Meanwhile, at least three of the officials involved in organizing and running the rally that preceded the violent storming of the Capitol are handing over documents in response to subpoenas.

The 11 organizers and staffers were given a Wednesday deadline to turn over documents and records as part of the committee’s investigation into the deadly insurrection that marked the most serious breach of the Capitol building since the War of 1812. The organizers have also been asked to appear at separate depositions the committee has scheduled beginning later this month.

Other subpoenas have also been served to top White House officials and Trump advisers, including former White House chief of staff Mark Meadows and adviser Steve Bannon, who has thus far refused to cooperate, putting him at risk of being charged with contempt.

At least nine people died during and after the attack, including a Trump supporter who was shot and killed by police as she tried to break into the House chamber.

(With AP inputs)