A close reading of the bill suggests it would allow the U.S. military to detain U.S. citizens without trial indefinitely in the U.S. based on suspected activity. Read the bill here, and then read the summarized points after the jump.
According to the summary, the bill sets out a comprehensive policy for the detention, interrogation and trial of suspected enemy belligerents who are believed to have engaged in hostilities against the United States by requiring these individuals to be held in military custody, interrogated for their intelligence value and not provided with a Miranda warning.
(There is no distinction between U.S. persons--visa holders or citizens--and non-U.S. persons.)
It would require these "belligerents" to be coded as "high-value detainee[s]" to be held in military custody and interrogated for their intelligence value by a High-Value Detainee Interrogation Team established by the president. (The H.I.G., of course, was established to bring a sophisticated interrogation capacity to the federal justice system.)
Any suspected unprivileged enemy belligerents considered a "high-value detainee" shall not be provided with a Miranda warning.