The Justice Department will notify a federal court Friday that it is joining one of his former racing teammates in suing him for using performance-enhancing drugs during the Tour de France, legal sources told NBC News. The government is signing on to a lawsuit filed two years ago by Floyd Landis, one of Armstrong's former Tour de France teammates who has already admitted cheating. Among its claims: Landis saw Armstrong store and then re-inject his own blood to boost his performance, and Armstrong twice gave Landis banned hormones before races.