LAS ANGELES - Cycling great Lance Armstrong formally responded to U.S. 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.The USADA sent Armstrong a letter dated June 12 advising of its intent to send formal charges to a review board. Armstrong and his lawyers had until Friday to submit his formal response.The USADA letter was not publicly released but reported by the Washington Post. Armstrong made his formal response public on Friday by tweeting a link to a copy of the filing.Lawyers for Armstrong asked the agency’s review board to recommend to the USADA to end its pursuit of the allegations, which had the immediate effect of banning him competing in triathlons and, if upheld, could strip him of his Tour de France titles.Accusations of doping have dogged Armstrong since he ascended to the top of the cycling world after overcoming cancer, but he has steadfastly denied taking banned drugs.In February, the U.S. Justice Department dropped an investigation centered on whether Armstrong and his teammates cheated the sponsor of their bike racing team with a secret doping program.That decision meant he would not face criminal charges from the two-year-long probe.However, the USADA said the end of the Justice Department’s criminal probe did not mean the doping agency would halt its own course of action.