re recall, baffert claiming a skin issue for a dermatological issue was responsible. medina spirit is the latest in what is now a long line of horses to die at santa anita race track in southern california. the deaths prompting investigations on which our nick watt has extensively chronicled. i hope you take a look at his fantastic reporting on that. thanks for joining us. ac 360 starts now. hey, good evening. we begin with breaking news and potentially a big break for the january 6th committee. s cooperation of-smrn who could not be closer to rope vice president into the former president s election scheme. cnn special correspondent, jamie gangel, is part of the team that got this exclusive. he? joins us now. so, jamie talking about the former choof chief of staff, mark short, what have you learned? we learned mark short, one of former vice president pence s closest advisers, his former chief of staff is cooperating