U.S. Drone in a hanger at Fort Huachuca, Arizona on March 10, 2010.
In a letter to Sen. Rand Paul, Holder said it was possible, "I suppose," to imagine an "extraordinary circumstance in which it would be necessary and appropriate" under U.S. law for the president to authorize the military to "use lethal force" within the United States.
The issue was raised during Senate consideration of John Brennan to be CIA director.
The Justice Department earlier in the day turned over new documents outlining the legal rationale for lawfully targeting Americans overseas who are involved in terror-related activities that threaten the United States or its interests.
But Paul wanted to know if the administration's drone policy could be carried out on American soil.