The president issued the proclamation shortly after returning to the White House from Florida, where he addressed the shooting at a previously scheduled campaign event. 

"If there was anything to take away from this tragedy it's the reminder that life is very fragile. Our time here is limited and it is precious,” Obama said. “What matters at the end of the day is not the small things. It's not the trivial things which so often consume us and our daily lives. Ultimately, it's how we treat one another and how we love one another.”

Later Friday afternoon, Obama plans to meet with members of his national security team. According to press secretary Jay Carney, those in attendance will include Vice President Biden, FBI Director Robert Mueller, Chief of Staff Jacob Lew, Homeland Security adviser John Brennan, White House counsel Kathy Ruemler and adviser Valerie Jarrett. Attorney General Eric HolderEric Himpton HolderThe American experience is incomplete without its neighbor – The argument for Americanism Eric Holder: Trump administration has 'brought shame to the nation’ with family separations US law is not on the side of Mueller's appointment as special counsel MORE is out of the country, and so cannot attend.