Doumar presided over the case of Yaser Esam Hamdi in the cases of "Hamdi v. Rumsfeld" and Jeffrey Spruill v. U.S., 243 F. Supp. 2d 527, 2002 U.S. Dist. LEXIS 25492 (E.D. Va., 2002). Doumar ruled that a U.S. citizen designated as an enemy combatant was entitled to a lawyer, and that the government had to provide evidence justifying his detention. The Fourth Circuit reversed Doumar, but the Supreme Court reversed the Fourth Circuit and upheld Doumar's basic rulings, 8-1, with multiple opinions. 542 U.S. 507 (2004). He also presided over the case against the Government of Sudan arising out of the bombing of the U.S.S. Cole in Yemen.