Who is Ed Martin, Trump's polarizing pick to lead DC's US Attorney's Office?

President Trump’s decision to appoint former Missouri lawyer Ed Martin as U.S. Attorney for Washington, D.C., sparked surprise, befuddlement and virulent opposition. ProPublica investigative reporter Jeremy Kohler discusses how Martin became a high-profile political figure in the Show Me State — in no small part due to his provocative public statements and pugnacious personality.