The Pac-12 has responded to football players who have threaten to opt-out of the season because of concerns related to health and safety, racial injustice and economic rights with a letter touting the conference's work in these areas and an invitation to meet later this week. A letter from  Pac-12 Commissioner Larry Scott was sent Monday to 12 football players leading the #WeAreUnited movement. The letter was obtained by The Associated Press and first reported by Sports Illustrated. The players say they have been communicating with more than 400 of their peers throughout the Pac-12.