WASHINGTON -- A senior staffer to a Republican congressman revealed Thursday that he has been formally reprimanded by the Army for his role in the Abu Ghraib detainee abuse scandal -- and that he is fighting the disciplinary move. He says that higher-ups were responsible for the treatment of prisoners at Abu Ghraib. U.S. Army Reserve Capt. Christopher R. Brinson, who in civilian life works as the deputy chief of staff for Alabama Republican Rep. Mike Rogers, was directly in charge of some of the military police later prosecuted for abuse at Abu Ghraib during the notorious autumn of 2003. Brinson received the reprimand in January 2006, but it had not been revealed publicly until his attorney, David P. Sheldon, confirmed it to Salon Thursday, noting that Brinson has since submitted a rebuttal to the Army. The attorney would not reveal the exact reason for Brinson's punishment. Through Sheldon, Brinson told Salon that he was unaware of his soldiers' actions, and blamed superior officers for what happened at the prison. Abu Ghraib blame?