 Tanya J. Powers, Fox News. Secret Service will be looking into how someone was able to come so close to killing the former president, firing from a rooftop about 400 feet away. Some witnesses reported seeing the shooter go from roof to roof before the shooting. Republican Speaker Mike Johnson says the House will conduct a full investigation. And House Oversight Committee Chairman James Comer is now calling on the Secret Service director to appear for a hearing on July 22nd.