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Mr. Hamdi, a U.S. citizen captured in Afghanistan, ultimately was sent to Saudi Arabia on the condition that he relinquish his citizenship. Padilla, also a U.S. citizen, was transferred to a civil court because the Bush administration worried the Supreme Court would rule his detention unconstitutional. He was convicted and imprisoned on terrorism charges.

Al-Marri was held for six years before the Obama administration transferred his case to federal court, where he pleaded guilty to supporting terrorism and received an eight-year prison term.