ABC News first reported the subpoena. Cipollone testified last month in a closed-door interview with the House select committee investigating the Jan. 6, 2021, attack on the U.S. Capitol. At the seventh public hearing, the House committee played excerpts from Cipollone’s testimony in which he agreed with other Trump officials that there was insufficient evidence of voter fraud and said he believed Trump should have conceded the election. Last month, the Department Justice brought two top aides to former Vice President Mike Pence, Mark Short and Greg Jacob, before a federal court. The moves signal that the Justice Department’s probe has reached inside the White House of former President Donald Trump, and that investigators are looking into conduct directly related to efforts by Trump and his closest allies to overturn his election loss. This story has been updated with additional background information.