The federal judge overseeing Michael Flynn’s criminal prosecution has directed the law firm that Flynn fired to reappear as an interested party in the controversial proceeding. On Thursday, that firm complied by filing a notice of appearance. U.S. District Judge Emmet Sullivan of the District of Columbia on Thursday ordered the clerk of the court to “add Covington & Burling LLP (‘Covington’) as an interested party in this matter and directed counsel for Covington to file a notice of appearance on behalf of Covington as an interested party.” John E. Hall, the chair of Covington Burling’s global litigation practice, submitted...