Mark McGwire has not cooperated with former Sen. George Mitchell's investigation into performance-enhancers in baseball, The New York Daily News reported Saturday. The former slugger has refused to meet with Mitchell and his investigators, a source told the newspaper. "They're getting no cooperation from McGwire," the source told the Daily News on Friday. "He wants nothing to do with this. He doesn't want to talk to them. He doesn't want his people to talk to them."