WASHINGTON The Trump White Houses top lawyer, Pat Cipollone, is set to appear before the House Jan. 6 committee on Friday, which would make him the highest-ranking official from the West Wing to provide testimony to the panel.

Cipollone did not immediately respond to a request for comment on multiple media reports that he has agreed to testify behind closed doors after having previously spoken to the committee informally.

Cipollone, according to former Trump administration officials, was among the most forceful voices telling Trump on Jan. 6 that his actions that day could expose him to criminal prosecution.

According to testimony already made public by the committee, Cipollone became the bulwark against Trumps attempts to overturn his election loss through various means, including trying to pressure the Department of Justice to send a letter falsely claiming there had been significant election fraud to states that Joe Biden had narrowly won or invoking the Insurrection Act to declare a form of martial law and seize voting machines.

His threats to resign along with others in the office became so well-known in Trumps inner circle that even Fox News host Sean Hannity wrote in a Dec. 31, 2020, text to chief of staff Mark Meadows: We cant lose the entire WH counsels office. And in a Jan. 5, 2021, text, he warned Meadows that pressure on Vice President Mike Pence would backfire: WH counsel will leave.