In the hours after the attacks of Sept. 11, 2001, a lawyer sat down in front of a computer and started writing a legal justification for taking action against those responsible. The language that he drafted and that President George W. Bush signed into law - called the Authorization for Use of Military Force (AUMF) - has at its heart one single sentence, 60 words long. Over the last decade, those 60 words have become the legal foundation for the "war on terror."
The first draft was rejected by Congress because it was too broad - but eventually agreement was reached.
The sentence reads:
"That the President is authorized to use all necessary and appropriate force against those nations, organizations, or persons he determines planned, authorized, committed, or aided the terrorist attacks that occurred on September 11, 2001, or harbored such organizations or persons in order to prevent any future acts of international terrorism against the United States by such nations, organizations or persons."