prosecutors say michael a. riley obstructed justice when he told a rioter to remove posts on social media showing they were in the capitol that day. riley s arrest is notable in more than the 600 insurrection cases because this makes him the first police officer on duty on capitol hill, charged with attempting to help a rioter. cnn s caitlin paland joins us. tell us what you know. we have not seen this related to the capitol riot. this is a charge against a u.s. capitol police officer michael riley, a 24-year veteran of the police force who was on duty on january 6th. he wasn t assigned to the capitol building himself but he was listening on the radio to colleagues under siege by the rioters and had been responding