The inquiry is a distraction for a Democratic president who has criticized his Republican predecessor's handling of classified material, and could cast a shadow over Biden as the two gear up for a possible 2024 election rematch.

U.S. Attorney General Merrick Garland said Robert Hur, who served as the top federal prosecutor in Maryland under Trump, will act as a quasi-independent prosecutor to determine whether classified records from Biden's time as vice president had been improperly stored at his residence in Delaware and a think tank in Washington.