WASHINGTON, D.C. ? Lawmakers have issued a subpoena seeking Pentagon information on a soldier who says he suffered retaliation for reporting abuses at Abu Ghraib prison.

The subpoena from the House Committee on Government Reform seeks all communications relating to information provided by Army Spc. Samuel Provance about the Iraq prison, where U.S. mistreatment of detainees caused an international uproar.

It also seeks information on the interrogation of an Iraqi officer there, identified by Provance as Gen. Hamid Zabar. Provance had helped interrogate Zabar’s 16-year-old son and later was told the boy had been captured and abused to compel the general to give information.

Provance has said his rank was reduced for disobeying orders not to speak about mistreatment he saw at Abu Ghraib. He was one of five government whistleblowers who testified before Congress in February, saying they faced retaliation for calling attention to alleged government wrongs.