Michael Flynn’s lawyers accused a federal judge Wednesday of shedding “any appearance of neutrality” in the criminal case against President Donald Trump’s former national security advisor. That claim was made in response to the judge’s appointment of an attorney to oppose the Department of Justice’s request to dismiss the case. Flynn’s lawyers also said that the judge’s appointee, John Gleeson, “engaged in a flagrant personal and partisan assault” when he argued that the Justice Department committed a “gross abuse of prosecutorial power” in seeking to drop the case. The “sheer duplicity” of Gleeson’s “scurrilous arguments” against the DOJ “is stunning,”...