Cipollone's former deputy Patrick Philbin is also reportedly scheduled to provide testimony to the grand jury on Friday.
Cipollone is the highest-ranking official who was in the West Wing in the waning days of Trump’s presidency.
This story is “unfolding in a way that is very serious,” Lofgren told Jake Tapper after Jan. 6 panel interviewed White House counsel for nearly eight hours.
Trump's former White House counsel answered a “variety of questions” and revealed some new information, which the panel will soon share, said Lofgren.
Cipollone’s central role came into focus when former White House aide Cassidy Hutchinson described his repeated efforts to stop Trump from joining the mob at the Capitol.
The news comes after Cassidy Hutchinson testified that Cipollone expressed serious concerns about the legality of Donald Trump's actions in the final days of his presidency.
The subpoena came one day after former White House aide Cassidy Hutchinson provided new details about Trump’s behavior on Jan. 6, 2021.
His statement shows how Trump's inner circle failed to take concerns about the rule of law seriously.
Michael Flynn, pardoned by the president after confessing to felonies, urged Trump to declare martial law at "raucous" meeting where Powell was discussed.
Trump's defense team, led by White House counsel Pat Cipollone, continues to argue that the president did nothing wrong in his dealings with Ukraine.