Lance Armstrong (pictured on June 9) has stepped up his attack on the US Anti-Doping Agency, saying the credibility of its case against him has been undermined by the fact that two key witnesses are ... more 

Lance Armstrong (pictured on June 9) has stepped up his attack on the US Anti-Doping Agency, saying the credibility of its case against him has been undermined by the fact that two key witnesses are self-confessed dope cheats less