Cycling great Lance Armstrong formally responded to US Anti-Doping Agency allegations by accusing the agency of rehashing discredited claims in a secretive and spiteful campaign that could strip him of his seven Tour de France titles.

"Just two months shy of the Olympic Games, the agency charged with monitoring Olympic athletes has chosen to devote its energies instead to 14-year-old charges against an athlete who is not involved in the coming games and who has never tested positive for the use of performance-enhancing drugs," his attorney Robert Luskin wrote.

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