Khalid Sheikh Mohammed is known as the principal architect of the attacks.
He has been kept in Guantanamo Bay since 2006.
But his pre-trial has been going on for nine years, with no set date yet for when the actual trial will begin, where he could face the death penalty for his crimes.
Kevin Powers, a national security expert at Boston College, who previously advised the Pentagon on Guantanamo issues, joined Kate Hawkesby.
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