NCAA President Charlie Baker said Friday that action by Congress was needed to protect what he described as the “95 percent” of athletes whose ability to play college sports would be endangered by a court ruling or regulatory decision declaring them as employees of their schools. Speaking to a small group of reporters near the NCAA's Washington office, Baker was realistic but still hopeful about the prospect of Congress doing what it didn't do despite persistent requests from his predecessor, Mark Emmert: granting the NCAA a limited antitrust exemption that would allow it to make rules safeguarding college sports without the constant threat of litigation.