The Obama Administration transferred al-Marri early this year once it secured U.S. Supreme Court dismissal of his legal challenge to detention-without-charge. (Prior posts here.) That challenge that had not reached final judicial determination notwithstanding that litigation had dragged on for well over 5 years.
Al-Marri's conviction by guilty plea came just 9 weeks after his indictment in the ordinary federal criminal justice system.
'Nuff said.