 Khan's attorneys at CCR petitioned to have his case tried in civilian court in the United States instead of by military tribunal at Guantanamo.A federal appeals court ruled in February 2007 that detainees at Guantanamo Bay could not use the U.S. court system to challenge their indefinite imprisonment.The Center for Constitutional Rights argued against the government's efforts to deny CCR attorneys access to Khan in a response brief filed November 3, 2006.