Brian McNamee gave federal prosecutors numerous pieces of evidence on Wednesday that his lawyers say back up his claim that he helped Roger Clemens injected performance-enhancing drugs, according to ESPN.com. Clemens returns to the Hill on Thursday to continue rebutting the claims. "Roger has been interested in sitting down one-on-one with members of the committee for quite awhile," Lanny Breuer, one of Clemens' lawyers, told ESPN. "We began scheduling these meetings before we heard about Mr. McNamee's latest stunt."