This guy is a US citizen. The constitution protects US citizens from being held without charges.

Even the worst criminals deserve due process. Tim McVeigh had a lawyer, Ted Kazinski had a lawyer, the snipers have a lawyer. This guy isn't accused of anything nearly as dire. Yet this US citizen and an unknown number of other US citizens are being held without charge, without legal representation and in violation of specific provisions of the constitution.

If he committed a crime, charge him. If he didn't release him. Pretty simple.