The U.S. Justice Department has formally filed a case suit against Lance Armstrong and his company Tailwind Sports for millions of dollars, stating he was "unduly enriched at the expense" of the United States Postal Service.

According to Yahoo, the Department of Justice said in February that they would join a whistle-blower lawsuit brought in 2010 by Armstrong's former teammate, Floyd Landis, and on Tuesday filed a formal complaint.

"The USPS paid approximately $40 million to sponsor the USPS cycling team from 1998 to 2004," the court document says.

The complaint filed in U.S. District Court for the District of Columbia claims that the use of prohibited drugs constitutes a breach of contract with the Postal Service.

CNN is reporting that the complaint names Armstrong, team manager Johan Bruyneel and Tailwind Sports LLC as defendants. Under the law, the Justice Department faced a 60 day deadline to file its case, which runs out Tuesday night.

Armstrong and his teammates from Tailwind Sports were paid $40 million by the Postal Service from 1998 to 2004, according to the suit. At the time, Armstrong's salary, excluding bonuses, was $17.9 million, according to the complaint.

The 41-year-old athlete won six of his seven Tour de France titles as a member of the USPS Pro Cycling team.

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