USADA lobbied DOJ to join lawsuit against Armstrong Lance Armstrong (R) of USA and team Astana climbs with Bradley Wiggins of Great Britain and team Garmin up de Col de la Colombiere, losing time to the leading pack, during stage 17 of the 2009 Tour de France from Bourg-Saint-Maurice to Le Grand-Bornand on July 22, 2009 on Col de la Colombiere, France. / Photo by Jasper Juinen/Getty Images AUSTIN, Texas The head of the U.S. Anti-Doping Agency has lobbied the Justice Department to join a whistle-blower lawsuit against cyclist Lance Armstrong filed by his former teammate Floyd Landis. The Justice Department has not announced whether it will join the case. The letter accuses Armstrong of committing fraud against the U.S. Postal Service, which sponsored most of his teams when Armstrong used performance-enhancing drugs to win the Tour de France. USADA chief executive Travis Tygart wrote Attorney General Eric Holder on Jan. 14, saying "fraud and other crimes were committed." The letter was first reported Thursday by Velonews.com, and The Associated Press independently obtained a copy, the day after Armstrong announced he would not speak under oath with USADA investigators. USADA officials said Armstrong was concerned about possible legal exposure in pending legal cases.