President Obama greets people on the apron as he arrives on Sunday, May 26, 2013, at Tinker Air Force Base in Midwest City, Okla., en route to the Moore, Okla., to see the response efforts to the severe tornadoes and weather that devastated the area. He will also visit with the families affected as well as first responders. (AP Photo/Carolyn Kaster)

Photo by: Carolyn Kaster

President Obama greets people on the apron as he arrives on Sunday, May 26, 2013, at Tinker Air Force Base in Midwest City, Okla., en route to the Moore, Okla., to see the response efforts to the severe tornadoes and weather that devastated the area. He will also visit with the families affected as well as first responders. (AP Photo/Carolyn Kaster)