In December, 2001 he was detained as a "material witness" to suspected acts of terrorism and ultimately charged with various terrorism-related offenses, mostly relating to false statements the FBI claimed he made as part of its 9/11 investigation. Al-Marri vehemently denied the charges, and after lengthy pre-trial proceedings, his trial on those charges was scheduled to begin on July 21, 2003.
But his trial never took place, because in June, 2003 -- one month before the scheduled trial -- President Bush declared him to be an "enemy combatant." As a result, the Justice Department told the court it wanted to turn him over to the U.S. military, and thus asked the court to dismiss the criminal charges against him, and the court did so (the dismissal was "with prejudice," meaning he can't be tried ever again on those charges). Thus, right before his trial, the Bush administration simply removed Al-Marri from the jurisdiction of the judicial system -- based solely on the unilateral order of the President -- and thus prevented him from contesting the charges against him.
This is what "The Greatest Generation" fought and died to stop. The current administration has demonstrated itself to be a perversion of everything this country has tried to do for hundreds of years. The last line will be when he starts sending the people in Gitmo to the "showers."