AP Source: Armstrong Tells Oprah He Doped [VIDEO]

Lance Armstrong is said to have confessed to Oprah Winfrey during an interview Monday that he used performance-enhancing drugs to win the Tour de France, may return taxpayer dollars and testify against other dopers.

Lance Armstrong attends the 2011 Pan-Massachusetts Challenge (Gail Oskin/Getty Images)

The person spoke to the Associated Press on condition of anonymity because the interview is to be broadcast Thursday on Winfrey's network.

Winfrey will talk about the interview with her best friend Gayle King on Tuesday's CBS This Morning according to the Hollywood Reporter.

Winfrey tweeted that her sitdown with Armstrong lasted 2 1/2 hours.

Oprah WInfrey tweet about Lance Armstrong interview (Twitter)

The US Department of Justice is considering whether to join a federal whistleblower lawsuit against Armstrong, reports the Wall Street Journal, because he defrauded the US government for $30million when the US Postal Service sponsored his cycling team. The deadline is Thursday.

The Justice Department has been considering its options since 2010, when the suit was filed by Armstrong's former teammate Floyd Landis.

Armstrong was stripped of all seven Tour titles last year in the wake of a voluminous U.S. Anti-Doping Agency report that portrayed him as a ruthless competitor, willing to go to any lengths to win the prestigious race. USADA chief executive Travis Tygart labeled the doping regimen allegedly carried out by the U.S. Postal Service team that Armstrong once led, "The most sophisticated, professionalized and successful doping program that sport has ever seen."

After a federal investigation of the cyclist was dropped without charges being brought last year, USADA stepped in with an investigation of its own. The agency deposed 11 former teammates and accused Armstrong of masterminding a complex and brazen drug program that included steroids, blood boosters and a range of other performance-enhancers.

CBS News reports that Armstrong will return some of the taxpayer money used by the US Postal Service to sponsor his cycling team. He has indicated he is willing to testify against others involved in illegal doping.

The Associated Press contributed to this story

Source: AP Source: Armstrong Tells Oprah He Doped [VIDEO]

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