Former White House counsel Pat Cipollone has been subpoenaed by a grand jury investigating events surrounding the Jan. 6, 2021, attack at the U.S. Capitol, according to multiple reports Tuesday evening.

Cipollone, who served under former President Donald Trump , is the highest-ranking official who was in the West Wing in the waning days of Trumps presidency. He was in the White House as the presidents supporters stormed the Capitol and was in attendance as Trump and his allies discussed ways he could stay in office and overturn the results of the 2020 election which Trump lost to Joe Biden in the weeks before the insurrection.

Cipollone pushed back against those efforts.

ABC News first reported news of the subpoena, although its unclear which grand jury Cipollone will be called before. There are currently at least two convened on the Jan. 6 events, one probing a plan by Trumps attorneys to put forward a slate of fake electors to declare him the winner of the 2020 race, and another homing in on the events on Jan. 6 itself.

The New York Times , citing a source familiar with the subpoena, added that its unclear how much information he could provide about the final days of Trumps presidency. During testimony before the House select committee into the Jan. 6 riot, he regularly cited attorney-client or executive privilege, although he did stress that he believed the president should have called off his supporters as they stormed the halls of Congress.