Joe diGenova, a former Trump campaign lawyer who backed President Donald Trump’s efforts to overturn his 2020 election loss, will head up a Florida-based federal investigation into former federal officials who investigated Trump, a Justice Department official confirmed to NBC News on Saturday. DiGenova, 81, who was U.S. attorney for the District of Columbia during the Reagan era, will lead a sprawling investigation targeting Trump's enemies, reaching all the way back to a previous Justice Department inquiry into Russian interference in the 2016 presidential election.