>> welcome back to "fox nation" in dep, that was a preview of las vegas massary, now on "fox nation," a look at deadliest mass shooting in american history, discover what really happened inside of route 91 harvest festival in las vegas, joining me now, jill schneider, retired special agent, in charge of san francisco of the atf . >> thank you. >> i am happy to be here. >> what was the atif's role in las vegas shooting investigation? >> atf's role any mass shoot we respond with all available resources as quickly as possible to assist with the