Congress also investigating tumult that roiled Justice Department in weeks leading up to riot as Trump and allies leaned on government lawyers to advance baseless claims that election results were fraudulent.

The House committee investigating the Jan. 6 riot at the U.S. Capitol has issued a subpoena to a former Justice Department lawyer who positioned himself as an ally of Donald Trump and aided the Republican president’s efforts to challenge the results of the 2020 election, AP reports.

The subpoena to Jeffrey Clark, revealed Wednesday, came amid signs of a rapidly escalating congressional inquiry. At least three of the people who were involved in organizing and running the rally that preceded the violent riot have handed over documents in response to subpoenas from the committee.

The demands for documents and testimony from Clark reflect the committee’s efforts to probe not only the deadly insurrection but also the tumult that roiled the Justice Department in the weeks leading up to it as Trump and his allies leaned on government lawyers to advance his baseless claims that the election results were fraudulent. Trump loyalists stormed the Capitol in an effort to disrupt the congressional certification of Democrat Joe Biden’s victory

Clark, an assistant attorney general in the Trump administration, has emerged as a pivotal character in that saga. A Senate committee report issued last week shows how he championed Trump’s efforts to undo the election results inside the Justice Department and clashed as a result with superiors who resisted the pressure, culminating in a dramatic White House meeting at which Trump floated the idea of elevating Clark to attorney general.

“The Select Committee’s investigation has revealed credible evidence that you attempted to involve the Department of Justice in efforts to interrupt the peaceful transfer of power,” the chairman of the committee, Democratic Rep. Bennie Thompson of Mississippi, wrote in a letter to Clark announcing the subpoena.

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