Description:The U.S. Anti-Doping Agency has brought formal doping charges against former cyclist Lance Armstrong, which could cost him his seven Tour de France titles. USADA's letter, dated June 12, alleges that Armstrong and five former cycling team associates engaged in a massive doping conspiracy from 1998-2011, and that 'the witnesses to the conduct described in this letter include more than ten cyclists.' Armstrong's attorney stated, 'These charges are a product of malice and spite and not evidence.'(1:02)