There are new questions emerging about the police response to the deadly mass shooting in Uvalde, Texas and the timeline of the attack. Meantime, some Republicans are suggesting “hardening” schools after the massacre. And after learning investigators needed DNA from parents to help identify the shooting victims, we look at how lethal an AR-15 style rifle can be to the human body. State Sen. Roland Gutierrez, Lisa Falkenberg, Michael Steele, Frank DeAngelis and Dr. Vin Gupta join.