The general purpose of the Insurrection Act is to limitÂ
presidential power, relying on state and local governments for initial response in the event of insurrection. TheÂ
Posse Comitatus Act prohibits the use of theÂ
United States Army andÂ
Air Force (which has also been extended by executive direction to theÂ
Navy) for routine law enforcement. Actions taken under the Insurrection Act, as an "
Act of Congress", are exempt from the Posse Comitatus Act.
[1][2]The Insurrection Act is brief. It allows the President, at the request of a state government, to federalize theÂ
National Guard and to use the remainder of the Armed Forces to suppress an insurrection against that state's government. It further allows for the President to do the same in a state without the explicit consent of a state's government if it becomes impracticable to enforce federal laws through ordinary proceedings or if states are unable to safeguard its inhabitants' civil rights.