According to The Washington Times a 2010 Pentagon Directive authorizes the President to use military force against civilians.
The directive contains noncontroversial provisions on support to civilian fire and emergency services, special events and the domestic use of the Army Corps of Engineers.
The troubling aspect of the directive outlines presidential authority for the use of military arms and forces, including unarmed drones, in operations against domestic unrest.
“This appears to be the latest step in the administration’s decision to use force within the United States against its citizens,” said a defense official opposed to the directive.
Directive No. 3025.18, “Defense Support of Civil Authorities,” was issued Dec. 29, 2010, and states that U.S. commanders “are provided emergency authority under this directive.”
“Federal action, including the use of federal military forces, is authorized when necessary to protect the federal property or functions,” the directive states.
Military assistance can include loans of arms, ammunition, vessels and aircraft. The directive states clearly that it is for engaging civilians during times of unrest.
You can read the entire Pentagon Directive here.