From the article..explaining the new law; whereas the president... with no other authority, backing or reason, can arrest anyone at any time:
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For now, however, the NDAA 2013 is almost law, and the president’s power to send troops to arrest Americans living in America remains intact and unabridged. That is rightfully terrifying to constitutionalists, journalists, and any other American who fears being kidnapped by the military and indefinitely detained.
Yes, the Feinstein-Lee Amendment explicitly guarantees the right of a trial by jury to American citizens, but it also explicitly authorizes the president to indefinitely detain them, a substantial step beyond even last year’s NDAA and the Authority for the Use of Military Force (AUMF), upon which it builds"