Chris Drozd, left, and Stefan Salvatore leave flowers and pictures for victims of the nightclub shooting on Sunday, at the Dr. Phillips Performing Arts Center, Monday, June 13, 2016 in Orlando, Fla. A gunman opened fire in a crowded Orlando nightclub early Sunday killing dozens of people. President Barack Obama, left, speaks to members of the media in the Oval Office of the White House in Washington, Monday, June 13, 2016, after getting briefed on the investigation of a shooting at a nightclub in Orlando by FBI Director James Comey, right, Homeland Security Secretary Jeh Johnson, not shown, and other officials. Craig Federighi, Apple senior vice president of software engineering, speaks at the Apple Worldwide Developers Conference in the Bill Graham Civic Auditorium, San Francisco, Monday, June 13, 2016. Omar Mateen, who killed 49 people at the club in Orlando, Florida, claimed to support Islamic State extremists, as well opposing groups such as Hezbolla and Nusra Front.