AUSTIN, Texas – The U.S. Anti-Doping Agency is bringing doping charges against seven-time Tour de France winner Lance Armstrong, threatening to strip his victories in those storied cycling races.

Armstrong could face a lifetime ban from the sport if he is found to have used performance-enhancing drugs. The move by USADA immediately bans him from competing in triathlons, which he turned to after he retired from cycling last year.

Armstrong, in a statement Wednesday, dismissed any doping allegations as "baseless" and "motivated by spite" and noted they came just months after federal prosecutors closed a two-year criminal investigation against the cyclist without bringing an indictment.