Khalid Sheikh Mohammed, the accused mastermind of the 9/11 attacks, and three co-defendants are slated for a trial before a military tribunal in June 2028.
It's the latest development in the U.S. military's struggle to bring to justice the man charged with planning the Sept. 11 attacks on the United States.
The decision puts back on track agreements that would have the three men plead guilty in exchange for being spared the possibility of the death penalty.