A Massachusetts Air National Guardsman charged with leaking highly classified military documents is due back in court on Wednesday for a hearing to decide whether he should remain behind bars while he awaits trial.

Jack Teixeira, 21, was arrested by heavily armed tactical agents at his Massachusetts home last week and charged, under the Espionage Act, with unauthorized retention and transmission of classified national defense information. During his first court appearance in Boston’s federal court Friday, a magistrate judge ordered him to remain in custody until Wednesday’s detention hearing.