You say it can't happen?  It has already happened throughout history, more than once!
HuffingtonPost.com (excerpts):  Washington - Indefinite military detention of Americans became the law of the land Saturday, as President Barack Obama signed a defense bill that codified that authority.  The National Defense Authorization Act states how the military is to be funded, but also includes a number of controversial provisions on arresting and holding suspected terrorists, which at first drove Obama...

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