Comment: First of all it doesn't

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First of all it doesn't

First of all it doesn't really matter if he is a citizen or not. "All men are endowed by their creator with certain unalienable rights..." Does the government have the authority to kill the rest of the world simply because they are not citizens?

Second, just leaving the country does not imply giving up citizenship, neither does stating you are no longer a citizen. By law there is a process for relinquishing citizenship.

Al Awlaki was a US Citizen at the time of his death. There is no evidence that he gave up his citizenship by joining a foreign army or otherwise, there are only claims. These claims have to be substantiated in court.

Even these standards are scary when considered within the context of what is happening today. Look at (7) and think about how that fits with the whole 2nd amendment thing going on.