Friends and family members embrace outside the Orlando Police Headquarters during the investigation of a shooting at the Pulse nightclub, where people were killed by a gunman, in Orlando, Florida, U.S June 12, 2016. (Photo by Steve Nesius/Reuters)





Cameron Cano of Miami, Florida stands outside the Stonewall Inn on Christopher Street, considered by some as the center of New York State's gay rights movement, following the shooting massacre at Orlando's Pulse nightclub, in the Manhattan borough of New York, U.S., June 12, 2016. (Photo by Andrew Kelly/Reuters)





A man waves a rainbow flag in front of two Boston Police vehicles outside a Pride Month block party in Boston, Massachusetts, U.S. June 12, 2016 the same day as the mass shooting at Orlando's Pulse nightclub. (Photo by Brian Snyder/Reuters)





Orlando residents Arissa Suarez (L) and Malcom Crawson attend a vigil at Lake Eola Park for victims of a mass shooting at a gay nightclub in Orlando, Florida, U.S June 12, 2016. (Photo by Steve Nesius/Reuters)





Los Angeles County Sheriff's deputies are seen behind a girl riding in a bus at the 46th annual Los Angeles Gay Pride Parade in West Hollywood, California, after a gunman opened fire at a gay nightclub in Orlando, Florida U.S. June 12, 2016. (Photo by David McNew/Reuters)





Two women hold each other at a vigil outside The Stonewall Inn on Christopher Street, considered by some as the center of New York State's gay rights movement, following the shooting massacre at Orlando's Pulse nightclub, in the Manhattan borough of New York, U.S., June 12, 2016. (Photo by Mark Kauzlarich/Reuters)





A girl takes part in a vigil to commemorate victims of a mass shooting at the Pulse gay night club in Orlando, Florida, U.S., June 12, 2016. (Photo by Adrees Latif/Reuters)





People hold up signs in solidarity at a candlelight vigil in remembrance for mass shooting victims in Orlando, from San Diego, California, U.S. June 12, 2016. (Photo by Mike Blake/Reuters)





Mourners gather under a LGBT pride flag flying at half-mast for a candlelight vigil in remembrance for mass shooting victims in Orlando, from San Diego, California, U.S. June 12, 2016. (Photo by Mike Blake/Reuters)





Christina Martin holds a candle as Janell Shaffer and Paige Goodlett (C) hug holding a sign at a candlelight vigil in remembrance for mass shooting victims in Orlando, from San Diego, California, U.S. June 12, 2016. (Photo by Mike Blake/Reuters)





People bring flowers for the victims of the shooting at a gay nightclub in Orlando to the U.S. Embassy in Berlin, Germany, June 13, 2016. (Photo by Hannibal Hanschke/Reuters)





Krystle Martin weeps as she views a makeshift memorial Monday, June 13, 2016, for the victims of a fatal shooting at the Pulse Orlando nightclub in Orlando, Fla. (Photo by Chris O'Meara/AP Photo)





A gunmen opened fire in a gay nightclub in Orlando, Fla. early Sunday morning killing 50 people and wounding 53 more. It's being called the worst mass shooting in U.S. history. Bill McKinney, of Orlando, left, leans his head on friend Keith Andrews' shoulder during a candlelight vigil at the Parliament House, a gay-friendly resort and club in Orlando. McKinney was at Pulse with friends until about 1:15 am. “I never go there”, he said through tears. (Photo by Melissa Lyttle/The Washington Post)





A man attends a candlelight vigil for the victims of the Pulse Nightclub shooting in Orlando, Florida, at Newtown Neighbourhood Centre on June 13, 2016 in Sydney, Australia. 50 people were killed and 53 injured after a gunman opened fire on people in a gay nightclub in Florida. It is the deadliest mass shooting in US history. (Photo by Daniel Munoz/Getty Images)





White roses and rainbow flags are displayed in front of the US Embassy in Berlin on June 13, 2016 as people pay tribute to the victims of the Orlando killing. 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. (Photo by John MacDougall/AFP Photo)





Tatiana Osorio, of Orlando, cries while giving blood at the OneBlood blood center near the mass shooting at a nightclub, June 13, 2016, in Orlando, Fla. Osorio lost three friends in the shooting. (Photo by David Goldman/AP Photo)





Annette Stubbs, a pastor at a local church, prays for victims a few blocks from a crime scene at the nightclub where a mass shooting took place the night before, along with members of her church, in Orlando, Fla., Sunday, June 12, 2016. A gunman opened fire inside the gay nightclub early Sunday, killing at least 50 people before dying in a gunfight with SWAT officers, police said. (Photo by Loren Elliott/Tampa Bay Times via AP Photo)





Two woman light candle during a vigil in front of the U.S. embassy to remember the victims of the mass shooting at the Pulse Orlando, Fla. nightclub, in Santiago, Chile, Sunday, June 12, 2016. A gunman opened fire inside the nightclub early Sunday, killing at least 50 people before dying in a gunfight with SWAT officers, police said. (Photo by Esteban Felix/AP Photo)





Afton McCall packages flowers from the In Bloom Florist and Orlando Wholesale Florists outside the LGBT Center of Central Florida on June 13, 2016 in Orlando, Fl. Groups gathered to volunteer to lend aid at the center to nearby agencies involved in Sunday's shooting. (Photos by Amanda Voisard/The Washington Post)





Runners pass under the the flags flying at half-staff around the Washington Monument at daybreak in Washington, Monday, June 13, 2016. The flags were ordered to half-staff by President Barack Obama to honor the victims of the Orlando nightclub shootings. (Photo by J. David Ake/AP Photo)