A federal grand jury has subpoenaed former Trump White House counsel Pat Cipollone in its investigation into the Jan. 6 assault on the U.S. Capitol and efforts to overturn the 2020 election, sources with direct knowledge of the matter told ABC News. The sources told ABC News that attorneys for Cipollone -- like they did with the House select committee investigating the Jan. 6 attack on the Capitol -- are expected to engage in negotiations around any appearance, while weighing concerns regarding potential claims of executive privilege. #capitolriot #jan6committee