President Barack Obama reacts to the mass shooting that left at least 50 people dead at a gay nightclub in Orlando, Florida.President Obama makes a statement about the deadly shooting at a gay nightclub in Florida. Omar Mateen shoot 50 dead and injured 53 in largest mass shooting in US history.President Barack Obama President said Americans were united in grief, outrage and "resolve to defend our people" after "an act of terror and an act of hate". The shooting at Pulse, a gay club in Orlando, is the worst mass shooting in recent US history.