U.S. prosecutors and defense attorneys for Michael T. Flynn asked a federal judge Tuesday to postpone Flynn’s long-delayed sentencing until after the Justice Department’s internal watchdog issues a report in coming weeks on the handling of the FBI’s investigation into possible coordination between Russia and the Trump campaign in 2016. Sentencing for President Trump’s former national security adviser is set for Dec. 18, and federal prosecutors were scheduled to notify the court Monday whether they would reverse their recommendation of probation and instead ask for prison time for the retired three-star Army general. However, in a terse, two-page filing, both...