n Thursday, cycling legend Lance Armstrong gave up his challenge to the U.S. Anti-Doping Agency's decision to strip him of his seven Tour de France titles and ban him from competitive cycling for life, saying "enough is enough." Armstrong rejected the USADA's doping allegations, saying he has never tested positive for performance-enhancing drugs, and said he will sue the U.S. anti-doping body if it pursues its sanctions against him. On Monday, a federal judge dismissed Armstrong's legal challenge of the USADA's authority to prosecute him; Armstrong argues that it's up to the International Cycling Union to decide if there's a case against him. "I know who won those seven Tours," Armstrong said in a statement. "The toughest event in the world where the strongest man wins. Nobody can ever change that."
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