The Justice Department unveiled its formal complaint against Armstrong on Tuesday, saying the cyclist violated his contract with the U.S. Postal Service and was "unjustly enriched" while cheating to win the Tour de France.
The government had previously announced it would join a whistle-blower lawsuit brought by former Armstrong teammate Floyd Landis under the federal False Claims Act. Tuesday was the deadline to file its formal complaint.
The Postal Service paid about $40 million to be the title sponsor of Armstrong's teams for six of his seven Tour de France victories. The filing in U.S. district court in Washington, D.C., says the USPS paid Armstrong $17 million from 1998-2004.
The lawsuit also names former team Armstrong team director Johan Bruyneel and team management company Tailwind Sports as defendants.
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