The order is a monumental defeat for Flynn and the Justice Department, whose lawyers have been arguing for the case's dismissal for months.
Flynn pleaded guilty in December 2017 to lying to the FBI about his conversations with Russia's ambassador to the US at the time, Sergey Kislyak, regarding US sanctions against Russia.
The case will now go back to US District Judge Emmet Sullivan, who had asked a veteran former judge and prosecutor to review the DOJ's motion to dismiss. Sullivan also planned to hold a hearing on the motion that was originally scheduled for July.
ï»¿a federal appeals court denied Michael Flynn