A suspect in the September 2012 attack on the U.S. consulate in Benghazi, Libya, pleaded not guilty Saturday in Washington federal district court, where he is charged with conspiracy to provide support and resources to terrorists.

The defendant, Ahmed Abu Khatallah, clad in a black sweatshirt and black pants, appeared before Magistrate Judge John Facciola. The judge, who said Khatallah posed a flight risk, ordered him held in custody.