President Donald Trump said Saturday that he would be nominating senior White House aide Lindsey Halligan to serve as the top federal prosecutor for the Virginia office that was thrown into turmoil when its U.S. attorney was pushed out Friday. The announcement came as Trump pressed Attorney General Pam Bondi to move forward with pursuing cases against some of his political opponents, part of a vow for retribution that has been a theme of his return to the White House.