The federal government has the authority to detain U.S. Citizens deemed enemy combatants under the AUMF.
The AUMF authorizes the President to use "all necessary and appropriate force" against "nations, organizations, or persons" associated with 9/11.
Those detained persons cannot be detained indefinitely—solely for the duration of the conflict.
The detainee must be accorded due process rights, including a meaningful factual hearing.
Mathews v. Eldridge Due Process Balancing Test:
The process due to a detainee si determined by weighing "the private interest that will be affected by the official action" against the government's asserted interest, including the burden that the government would face in providing greater process.
The balance that was struck: citizen-detainees must receive notice of the factual basis for their classification as an enemy combatant and have a fair opportunity to rebut assertions before a neutral decision-maker.
The government may accept hearsay evidence and apply a general presumption in its own favor here.