Mourners in Washington DC hold vigil in reaction to mass shooting in Orlando, Florida

Mourners hold up signs during a vigil in Washington, DC on June 12, 2016, in reaction to the mass shooting at a gay nightclub in Orlando, Florida.  Fifty people died when a gunman allegedly inspired by the Islamic State group opened fire inside a gay nightclub in Florida, in the worst terror attack on US soil since September 11, 2001. / AFP PHOTO / Andrew Caballero-Reynolds
Mourners hold up signs during a vigil in Washington, DC on June 12, 2016, in reaction to the mass shooting at a gay nightclub in Orlando, Florida.
Fifty people died when a gunman allegedly inspired by the Islamic State group opened fire inside a gay nightclub in Florida, in the worst terror attack on US soil since September 11, 2001. / AFP PHOTO / Andrew Caballero-Reynolds