WASHINGTON — A retired judge on Wednesday urged a federal court not to allow the Justice Department to dismiss its criminal case against President Donald Trump's former adviser Michael Flynn, citing evidence of a "gross abuse of prosecutorial power." The U.S. district judge hearing the case, Emmet Sullivan, last month tapped John Gleeson to serve as a "friend of the court," after the Justice Department abruptly asked the court to dismiss the criminal charge against Flynn, a former national security adviser. The stunning move by the Justice Department followed a pressure campaign by Trump and his conservative allies and came...