Can you point me to where it says that the military cannot be used on US citizens? For me, the issue is whether we are talking about war or criminal activity. If a US citizen joins with a known enemy of the US, such as Al Qaeda, he is subject to the same treatment as any Al Qaeda member.
The issue is, how is it determined whether a citizen has joined forces with our enemies? Can the President or his representatives simply say so, without any evidence? If evidence is required, what is the nature of the evidence that is required? Is there any legal "backstop" to assure that the exercise of this sort of power is not abused?
Andy where is Code Pink? The ACLU? Their silence proves, again, that these groups are merely political.