Judge Appoints Outsider to Take On Justice Dept. in Flynn Case

The federal judge overseeing the case against President Trump’s former national security adviser Michael T. Flynn appointed a hard-charging former prosecutor and judge on Wednesday to oppose the Justice Department’s effort to drop the case and to explore a perjury charge against Mr. Flynn.

Judge Emmet G. Sullivan’s appointment of the former judge, John Gleeson, was an extraordinary move in a case with acute political overtones. Mr. Flynn pleaded guilty twice to lying to investigators as part of a larger inquiry into Russia’s interference in the 2016 election.

Mr. Flynn...