Answer:
b. Hamdi v. Rumsfeld case.
Explanation:
According to my research on different law cases that had to do with US citizens as traitors, It can be said that the case in question based on the information provided was the Hamdi v. Rumsfeld case. This case was handled in 2004 and basically states (like mentioned in the question) that enemy combatants of the US that are US citizens have the right for due process.
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