Federal prosecutors filed new criminal charges on Tuesday against two ex-FBI counterintelligence officials, accusing them of obstructing a congressional proceeding and lying to lawmakers about their roles in the bureau's investigations of Hunter Biden.

The unsigned and unsworn superseding complaint, filed early Tuesday morning, comes just hours before the defendants Nikki Floris and Bradley Benavides are due to appear in federal court in Washington, D.C. for a preliminary hearing. 

At that hearing, attorneys for Floris and Benavides are expected to grill one of the government's witnesses to test the strength of the complaint and whether the Justice Department can demonstrate that there is probable cause to believe a crime was committe...