Armstrong stepping down as Livestrong chairman
Armstrong Doping Cycling
Credit: AP
FILE - In this July 25, 1999 file photo, Tour de France winner Lance Armstrong of the U.S. holds up the trophy on the podium after 20th and final stage of the Tour de France cycling race between Arpajon and Paris. Tyler Hamilton, a former teammate of Armstrong, has told CBS News that he used performance-enhancing drugs with the seven-time Tour de France winner to cheat in cycling races, including the tour. Armstrong has steadfastly denied doping and has never failed a drug test. (AP Photo/Michel Spingler, File)
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