Separately, one of his main corporate sponsors, Nike Inc., said it was ending its sponsorship of Armstrong. 

"To spare the foundation any negative effects as a result of controversy surrounding my cycling career, I will conclude my chairmanship," Armstrong said in a statement. 

Armstrong is set to lose his record seven Tour de France titles after the U.S. Anti-Doping Agency published a 1,000-page report last week that said the now-retired American took part in and organized an elaborate and sophisticated doping scheme on his way to his unrivalled success on the Tour.