Trivia question: What do Anwar al-Awlaki, Yaser Esam Hamdi, and newborn twin daughters of Mexican drug lord Joaquin Guzman have in common? You were probably ready to hit the buzzer and answer something like "What is Islamic terrorism"-until you finished reading the entire question. The correct answer: "What is 'presumed' US citizenship." The adjective "presumed" was used by Justice Scalia to describe Hamdi's US citizenship in the famous 2004 case of Hamdi v. Rumsfeld. Although Justice Scalia did not elaborate on his usage of "presumed" in the opening of his dissenting opinion in Hamdi, the government's Respondent brief and both...