Transcript for DOJ Joins Fight Against Lance Armstrong Following Doping Scandal
The holes in the prosecution's out of millions. And it wants the money back. In today's economic climate, the u.S. Postal service is simply not in a position to allow lance armstrong to walk away with... See More
The holes in the prosecution's out of millions. And it wants the money back. In today's economic climate, the u.S. Postal service is simply not in a position to allow lance armstrong to walk away with tens of millions of dollars illegitimately procured. Did you ever take banned substances to enhance your cycling performance? Yes. Reporter: What armstrong revealed to oprah began as a whistle-blower face. Floyd landis filed this claim under seal, arguing he was a witness. Witness. Arms armstrong and his associates cheated the postal service.Ice. Arm strons bro arm strons broke his silence in an abc news exclusive in 2010. That should be evidence enough there's a problem with the system. Reporter: The I'm saying a bunch of people did it. To upon sor Reporter: The postal service paid more than $30 million to upon sore armstrong's team. The case seeks triple damages plus penalties. Roughly $100 million.Y by far, the biggest of armstrong's many all over, wil multimillion-dollar legal headaches.Ong's attorney says the question is, when this is all over, will lance armstrong be bankrupt? Reporter: Armstrong's attorney says settlement talks with the government broke down because, we disagree about whether the postal service was damaged.Bout his adding that he believes he profited from years of stellar publicity.. My two but in "texas monthly" this week, armstrong was blunt about his troubles. The stain's not going away. My girls will grow into it. My two little ones will grow into it. Seattle. This stain will live forever. I'll never get rid of it.
This transcript has been automatically generated and may not be 100% accurate.