u.s. park police, virginia state police and especially the alexandria police for their work in helping us to respond and mitigate this incident. we continue to provide a robust and visible presence at a capitol complex and to monitor national and world events to provide a level of security that's appropriate for the u.s. congress. >> can you describe officer griner's response after being shot and continuing to work to get the suspect. >> that's part of the ongoing investigation and i won't comment on it. >> the missions of the capitol police, the agents who were with congressman scalise, give us a sense. is that a protective detail? what's their mission? how does that work? >> their particular assignment today was to protect the congressman. >> was he the only one who had a protective detail today? >> today's date we have capitol police officers assigned to monitor this event. >> chief brown, there's video and audio recordings of the gunfire and gun battle, and it would appear to have been