Isn’t there a law somewhere that says you renounce your United States citizenship when you take up arms against the United States? I’m pretty sure this guy was no longer a citizen - by his own choice.
"No person shall... be deprived of life, liberty, or property, without due process of law..." 5th amendment, Bill of Rights
I don't agree the President has the authority to declare, without due process of law, that someone is an enemy of the state and can be exectuted.
What do you do when the President declares you an enemy of the state?
"Rightwing extremism in the United States can be broadly divided into those groups, movements, and adherents that are primarily hate-oriented (based on hatred of particular religious, racial or ethnic groups), and those that are mainly antigovernment, rejecting federal authority in favor of state or local authority, or rejecting government authority entirely. It may include groups and individuals that are dedicated to a single issue, such as opposition to abortion or immigration." - “Rightwing Extremism: Current Economic and Political Climate Fueling Resurgence in Radicalization and Recruitment”, Department of Homeland Security, April 7, 2009
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William Roper: So, now you give the Devil the benefit of law!
Sir Thomas More: Yes! What would you do? Cut a great road through the law to get after the Devil?
William Roper: Yes, I'd cut down every law in England to do that!
Sir Thomas More: Oh? And when the last law was down, and the Devil turned 'round on you, where would you hide, Roper, the laws all being flat? This country is planted thick with laws, from coast to coast, Man's laws, not God's! And if you cut them down, and you're just the man to do it, do you really think you could stand upright in the winds that would blow then? Yes, I'd give the Devil benefit of law, for my own safety's sake!