The Homeland Security Act (HSA) of 2002 was an act of Congress, introduced in the aftermath of the September 11 attacks, that established the Department of Homeland Security and reorganized the US federal government. The HSA was cosponsored by 118 members of Congress. The act passed the U.S. Senate by a vote of 90–9, with one senator not voting. It was signed into law by President George W. Bush in November 2002.