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Lance Armstrong pauses during an interview in Austin, Texas on Feb. 15, 2011. In 2012, Armstrong decided to give up the battle against doping charges, saying "enough is enough" but acknowledging no wrongdoing. The move began his swift fall from being perhaps the nation's best-known cancer-fighting hero, and though he maintains he was victimized by a "witch hunt" he was still stripped of all seven of his Tour de France victories. (AP Photo/Thao Nguyen, File)

Overall leader Lance Armstrong of the U.S., left in yellow, and the rest of the pack climb Tamie pass during the ninth stage of the Tour de France cycling race between Le Grand-Bornand, French Alps, and Sestrieres in the Italian Alps Tuesday, July 13, 1999. (AP Photo/Laurent Rebours)

Overall leader Lance Armstrong of Austin, Texas, center left with yellow jersey, rides with the pack at the start of the 13th stage of the Tour de France cycling race between Lavelanet and Beziers, southwestern France, Saturday, July 20, 2002. (AP Photo/Christophe Ena)

Lance Armstrong of Austin, Texas, puts his helmet on prior to the start of the second stage of the Tour de France cycling race between the Futuroscope theme park in Poitiers and Loudun, central France, Sunday, July 2, 2000. (AP Photo/Christophe Ena)

Tour de France winner Lance Armstrong is kissed by his wife Kristin, left, and his mother Linda after the 20th and final stage of the Tour de France cycling race in Paris on July 25, 1999. (AP Photo/Laurent Rebours, File)

Then Astana rider Lance Armstrong, center, cycles during the third stage of the 96th Tour de France cycling race between Marseille and La Grande-Motte on July 6, 2009. Armstrong has been stripped of his seven Tour de France titles and banned for life after the International Cycling Union (UCI) said on October 22, 2012 it had ratified the United States Anti-Doping Agency's (USADA) sanctions. REUTERS/Bogdan Cristel

Lance Armstrong, founder of the LIVESTRONG foundation, takes part in a special session regarding cancer in the developing world during the Clinton Global Initiative in New York on September 22, 2010. REUTERS/Lucas Jackson

President Clinton picks up a light-weight racing bicycle presented to him as a gift from the recent Tour de France victor, Lance Armstrong, in the Rose Garden of the White House in Washington, Tuesday, August 10, 1999. Armstrong, an American, was celebrated by the French as well as his own countrymen, because of his victory despite being a victim of cancer. (AP Photo/J. Scott Applewhite)

A picture posted by Lance Armstrong on his Twitter account on November 10, 2012 shows him laying on a couch with his seven Tour de France yellow jerseys in the background. The picture was sent to Armstrong's 3.8 million Twitter followers under a message reading "Back in Austin and just layin' around." REUTERS/Lance Armstrong

Two-time Tour de france winner Lance Armstrong, of Austin, Texas, gestures during a news conference in Paris, Monday April 9, 2001, as his lawyer Georges Kiejman, of France, looks on. Armstrong said Monday that French officials investigating his U.S. Postal cycling team have found no evidence of doping in urine samples tested so far. Officials are looking into whether Armstrong's team may have used banned performance-enhancing substances during the 2000 Tour, which Armstrong won for the second straight year. (AP Photo/Laurent Rebours)

Lance Armstrong celebrates as he crosses the finish line and wins the 17th stage of the 91st Tour de France cycling race between Bourg-d'Oisans and Le Grand Bornand, on July 22, 2004. Disgraced cyclist Lance Armstrong, who was stripped of his seven Tour de France titles for doping, is weighing whether to admit he used performance-enhancing drugs, The New York Times reported on January 5, 2013. PATRICK KOVARIK/AFP/Getty Images

Lance Armstrong of Austin, Texas, crosses the finish line to win the professional men's world championship road race in Oslo, Norway, Sunday, Aug. 29, 1993. (AP Photo/Michel Euler)

Overall leader Lance Armstrong of the U.S. strains on his way to win the 19th stage of the Tour de France cycling race, a 57-kilometer individual time trial around the Futuroscope theme park near Poitiers, western France, Saturday, July 24, 1999. (AP Photo/Laurent Rebours)

Lance Armstrong of USA and team Astana crosses the finish line at the end of stage 15 of the 2009 Tour de France from Pontarlier to Verbier on July 19, 2009 in Verbier, Switzerland. Armstrong stands second in the overall standings after stage 15 with 1 minute and 37 seconds behind his teammate, new race leader Alberto Contador of Spain. (Photo by Jasper Juinen/Getty Images)

Discovery Channel team rider Lance Armstrong of the U.S. stands with his hand on his heart during the playing of national anthems after he won his seventh straight Tour de France in Paris on July 24, 2005. REUTERS/Francois Lenoir

World champion cyclist Lance Armstrong of the United States poses with cheerleaders before start of the first stage of the Tour de France cycling race in Lille, northern France, Sunday, July 3, 1994. (AP Photo/Laurent Rebours)

Race winner Lance Armstrong of Austin, Texas, (2nd from right), best sprinter Erik Zabel of Germany (2nd from left), best climber Laurent Jalabert of France (left) and best young rider Oscar Sevilla of Spain wave on the podium after the 20th and final stage of the Tour de France cycling race between Corbeil Essones and the Champs Elysees avenue in Paris on Sunday, July 29, 2001. (AP Photo/Christophe Ena)

World champion cyclist Lance Armstrong of the United States poses with cheerleaders before start of the first stage of the Tour de France cycling race in Lille, northern France, Sunday, July 3, 1994. (AP Photo/Laurent Rebours)

Three-time Tour de France winner Lance Armstrong of Austin, Texas, undergoes medical examinations ahead of the Tour de France cycling race in Luxembourg, Thursday, July 4, 2002. The 21-stage Tour will start in Luxembourg on Saturday July 6, 2002, to end in Paris on July 28. (AP Photo/Laurent Rebours/Pool)

Seven-time winner Lance Armstrong of USA and team Astana in action during the first time trail of the 2009 Tour de France on July 4, 2009 in Monaco. (Photo by Koen Haedens/Getty Images)

Cyclist Lance Armstrong of Austin, Texas, walks out of the Tour de France's anti-doping control bus after the 16th stage of the Tour de France cycling race between Les Deux Alpes and La Plagne, French Alps on July 24, 2002. The U.S. Anti-Doping Agency is bringing doping charges against the seven-time Tour de France winner, questioning how he achieved those famous cycling victories. Armstrong, who retired from cycling last year, could face a lifetime ban from the sport if he is found to have used performance-enhancing drugs. He maintained his innocence, saying: "I have never doped." (AP Photo/Peter Dejong, File)

Tour de France overall leader Lance Armstrong of Austin, Texas, center, and his teammates from left: Benoit Joachim of Luxembourg, Kevin Livingstone and George Hincapie of the United States, and Vjatceslav Ekimov of Russia, ride up the Champs Elysees avenue during the 21st and final stage of the Tour de France cycling race in Paris on Sunday, July 23, 2000. (AP Photo/Laurent Rebours)

Overall leader Lance Armstrong, of Austin, Texas, rides down the Champs Elysees avenue past U.S. flags during the 20th and last stage of the Tour de France cycling race between Montereau, southeast of Paris, and the Champs-Elysees in Paris on July 25, 2004. Federal prosecutors said, Friday, Feb. 3, 2012, they are closing a criminal investigation of Armstrong and will not charge him over allegations the seven-time Tour de France winner used performance-enhancing drugs. (AP Photo/Franck Prevel, File)

Three-time Tour de France winner Lance Armstrong of Austin, Texas, ponders a question during a press conference after undergoing medical examinations ahead of the Tour de France cycling race in Luxembourg, Thursday, July 4, 2002. The 21-stage Tour will start in Luxembourg on Saturday July 6, 2002, to end in Paris on July 28. (AP Photo/Christophe Ena)

Astana rider Lance Armstrong of the U.S. prepares to start the individual time trial in the first stage of the 96th Tour de France cycling race in Monaco on July 4, 2009. Armstrong, the disgraced American cyclist at the center of the biggest doping scandal in the sport's history, may admit he used performance-enhancing drugs during his career, the New York Times reported in editions on January 5, 2013, citing "several people with direct knowledge of the situation." The newspaper said Armstrong, 41, has told associates and anti-doping officials he may make the admission in hopes of persuading anti-doping officials to allow him to resume competition in athletic events that adhere to the World Anti-Doping Code, under which Armstrong is currently subject to a lifetime ban. REUTERS/Jean-Paul Pelissier

Three-time Tour de France winner and leader of the U.S. Postal Service cycling team, Lance Armstrong of Austin, Texas, center, is surrounded by race officials as he waits in an elevator upon his arrival at the Tour de France press and medical center, Thursday June 4, 2002 in Luxembourg. Armstrong is to undergo medical examinations and will give a press conference on Thursday, ahead of the Tour de France cycling race due to start next Saturday July 6 from Luxembourg. (AP Photo/Peter Dejong)

Seven-time Tour de France winner Lance Armstrong of the U.S. reacts during the Tour of California in Visalia, California on May 20, 2010. Armstrong has stepped down as chairman of the charity he founded, Livestrong, after U.S. anti-doping officials issued a scathing report detailing his use of performance-enhancing drugs for years as one of the world's premier cyclists, the foundation said October 17, 2012. Separately, one of his main corporate sponsors, Nike Inc. said it was ending its sponsorship of Armstrong. REUTERS/Anthony Bolante