"Authority for Use of Military Force to Combat Terrorist Activities Within the United States" is the name of a 37-page classified

Classified information

Classified information is sensitive information to which access is restricted by law or regulation to particular groups of persons. A formal security clearance is required to handle classified documents or access classified data. The clearance process requires a satisfactory background investigation...

 United States Department of Justice

United States Department of Justice

The United States Department of Justice , is the United States federal executive department responsible for the enforcement of the law and administration of justice, equivalent to the justice or interior ministries of other countries.The Department is led by the Attorney General, who is nominated...

 memorandum

Memorandum

A memorandum is from the Latin verbal phrase memorandum est, the gerundive form of the verb memoro, "to mention, call to mind, recount, relate", which means "It must be remembered ..."...

 dated March 13, 2003. Its existence is known because it was referred to in another Department of Justice memo. According to the latter memo, the former memo argued that the Fourth Amendment to the United States Constitution

Fourth Amendment to the United States Constitution

The Fourth Amendment to the United States Constitution is the part of the Bill of Rights which guards against unreasonable searches and seizures, along with requiring any warrant to be judicially sanctioned and supported by probable cause...

had no application to domestic military operations. The memo has been released to the public.