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U.S. President Barack Obama's motorcade exits the tornado ravaged Plaza Towers Elementary School after visiting with residents and families on May 26, 2013 in Moore, Oklahoma. The tornado of EF5 strength and two miles wide touched down May 20 killing at least 24 people and leaving behind extensive damage to homes and businesses. U.S. President Barack Obama promised federal aid to supplement state and local recovery efforts. (Photo by Tom Pennington/Getty Images) ( 169525706 )

U.S. President Barack Obama greets emergency workers at Fire Station #1 in Moore, Oklahoma, May 26, 2013. Obama arrived in Moore on Sunday to tour the town that was hammered last week by a powerful tornado that killed 24 people and assure its residents that the federal government would provide long-term help. REUTERS/Jonathan Ernst ( USA-TORNADOES-OBAMA/ )

People watch as U.S. President Barack Obama's motorcade arrives for a tour of the tornado-damaged area May 26, 2013 in Moore, Oklahoma. President Obama toured Plaza Towers Elementary School where 7 children were killed by the May 20 tornado during his visit to Moore. (Photo by Scott Olson/Getty Images) ( 169527100 )

President Barack Obama greets Robert Romines, Asst. Superintendent, Personnel for Moore Schools, and Susan Pierce, Superitendent of Moore Schools, and tornado victims at Plaza Towers Elementary in Moore, Okla., on Sunday, May 26, 2013. Obama visited tornado-devastated Moore, Oklahoma, consoling people staggered by the loss of life and property and promising that the government will be behind them "every step of the way." (AP Photo/The Oklahoman, Bryan Terry, Pool) ( Obama Oklahoma Tornado )

U.S. Air Force Capt Ryan Gers and 1st Lt Kyle Schroeder help a resident dig through a tornado ravaged home ahead of a U.S. President Barack Obama's visit to the area on May 26, 2013 in Moore, Oklahoma. The tornado of EF5 strength and two miles wide touched down May 20 killing at least 24 people and leaving behind extensive damage to homes and businesses. U.S. President Barack Obama promised federal aid to supplement state and local recovery efforts. (Photo by Tom Pennington/Getty Images) ( 169513289 )

A member of the president's security detail stands guard during a visit by U.S. President Barack Obama to the tornado-damaged area May 26, 2013 in Moore, Oklahoma. President Obama toured Plaza Towers Elementary School where 7 children were killed by the May 20 tornado during his visit to Moore. (Photo by Scott Olson/Getty Images) ( 169527085 )

President Barack Obama tours the Plaza Towers addition in Moore, Okla., beside Moore Mayor Glenn Lewis on Sunday, May 26, 2013. (AP Photo/The Oklahoman, Bryan Terry, Pool) ( Obama Oklahoma Tornado )

Secret Service agents scan the rubble as U.S. President Barack Obama (not pictured) tours tornado damage in Moore, Oklahoma, May 26, 2013. Obama arrived in Moore on Sunday to tour the town that was hammered last week by a powerful tornado that killed 24 people and assure its residents that the federal government would provide long-term help. REUTERS/Jonathan Ernst ( USA-TORNADOES-OBAMA/ )

US President Barack Obama looks at a pile of debris as he visits the tornado affected Plaza Towers Elementary School on May 26, 2013 in Moore, Oklahoma. Obama is in the Oklahoma City area to survey damage from the tornado which struck a week ago and meet with victims and first responders. MANDEL NGAN/AFP/Getty Images ( 520093477 )

A worker cleans out a tornado-damaged home May 26, 2013 in Moore, Oklahoma. U.S. President Barack Obama toured the area today. (Photo by Scott Olson/Getty Images) ( 169528589 )

President Barack Obama views the devastation of Moore, Okla., with Mayor Glenn Lewis, second from left in black shirt, and Oklahoma Gov. Mary Fallin, right, Sunday, May 26, 2013, in Moore, Okla. The town was devastated the week before by a massive tornado and severe weather. (AP Photo/Carolyn Kaster) ( Obama Oklahoma Tornado )

U.S. President Barack Obama's motorcade waits amidst tornado rubble as he tours storm damage in Moore, Oklahoma, May 26, 2013. Nearly one week ago a monster tornado ravaged the town, killing 24 people. REUTERS/Jonathan Ernst ( OBAMA/ )

U.S. President Barack Obama (C) walks with Plaza Tower Elementary School Principal Amy Simpson (2nd L), Oklahoma Governor Mary Fallin (2nd R), and FEMA Administrator Craig Fugate (R) in Moore, Oklahoma, May 26, 2013. Nearly one week ago a monster tornado ravaged the town, destroying the school and killing 24 people. REUTERS/Jonathan Ernst ( OBAMA/ )

U.S. President Barack Obama stands with survivors and first responders as he speaks to reporters amidst the rubble of the tornado-destroyed Plaza Towers Elementary School in Moore, Oklahoma, May 26, 2013. Nearly one week ago a monster tornado ravaged the town, killing 24 people. REUTERS/Jonathan Ernst ( OBAMA/ )

President Barack Obama greets a group of armed forces personnel and several families affected by the May 20th tornado at Tinker Air Force Base as he departed from his visit to Moore, Okla. on Sunday May 23, 2013 in Oklahoma City. (AP Photo/Nick Oxford) ( Obama Oklahoma Tornado )

President Barack Obama tours the devastated Plaza Towers Elementary School and surrounding area with Moore, Okla. Mayor Glenn Lewis, left, Oklahoma Gov. Mary Fallin, right, and Rep. Tom Cole, R-Okla., second from right, Sunday, May 26, 2013, in Moore, Okla., caused by tornado and severe weather last week. (AP Photo/Carolyn Kaster) ( Obama Oklahoma Tornado )

Police officers block residents and volunteers from getting to homes near the Plaza Towers Elementary School because the area has been secured for a visit by President Barack Obama on May 26, 2013 in Moore, Oklahoma. A tornado hit Moore on May 20, killing at least 24 people and destroying hundreds of homes and businesses. (Photo by Scott Olson/Getty Images) ( 169512750 )

US President Barack Obama hugs Briarwood School Principal Shelley Jacques McMillian during a tour of the tornado affected Plaza Towers Elementary School on May 26, 2013 in Moore, Oklahoma. Obama is in the Oklahoma City area to survey damage from the tornado which struck a week ago and meet with victims and first responders. MANDEL NGAN/AFP/Getty Images ( 520088587 )

An overturned car is seen near the tornado affected Plaza Towers Elementary School on May 26, 2013 in Moore, Oklahoma. US President Barack Obama offered solace and support to residents of Oklahoma on Sunday as they rebuild their shattered lives after a monster tornado killed 24 people. MANDEL NGAN/AFP/Getty Images ( 520093466 )

President Barack Obama is surrounded by the rubble of the Plaza Towers Elementary School as he speaks to media in the company of school and state officials Sunday, May 26, 2013, in Moore, Okla., which was devastated by a massive tornado and severe weather last week. (AP Photo/Carolyn Kaster) ( Obama Oklahoma Tornado )

President Barack Obama views the devastation at Plaza Towers Elementary School caused by tornado and severe weather last week with school officials, Sunday, May 26, 2013, in Moore, Okla. Second from left is Briarwood Principal Shelley Jaques McMillian. (AP Photo/Carolyn Kaster) ( Obama Oklahoma Tornado )

President Barack Obama embraces Julie Lewis, seen with her husband Scott Lewis, and their son Zack, hidden, a third-grader of the destroyed Plaza Towers Elementary School seen in the background, as Obama visits Moore, Okla., Sunday, May 26, 2013, in Moore, Okla., which was utterly devastated by tornadoes and severe weather last week. (AP Photo/Carolyn Kaster) ( Obama Oklahoma Tornado )

President Barack Obama embraces Plaza Towers Elementary School principal Amy Simpson as he tours the devastated school Sunday, May 26, 2013, in Moore, Okla., caused by tornado and severe weather last week. (AP Photo/Carolyn Kaster) ( Obama Oklahoma Tornado )

US President Barack Obama tours a tornado affected area on May 26, 2013 in Moore, Oklahoma. Obama is in the Oklahoma City area to survey damage from the tornado which struck a week ago and to meet with victims and first responders. MANDEL NGAN/AFP/Getty Images ( 520086426 )

US President Barack Obama talks with members of Norman Police while visit a command center set up at Moore Fire Department Station #1 in the tornado affected city of Moore, Oklahoma on May 26, 2013. US President Barack Obama offered solace and support to residents of Oklahoma on Sunday as they rebuild their shattered lives after a monster tornado killed 24 people. MANDEL NGAN/AFP/Getty Images ( 520093464 )

Damaged cars are seen near the tornado affected Plaza Towers Elementary School on May 26, 2013 in Moore, Oklahoma. US President Barack Obama offered solace and support to residents of Oklahoma on Sunday as they rebuild their shattered lives after a monster tornado killed 24 people. MANDEL NGAN/AFP/Getty Images ( 520093468 )

City of Moore Mayor Glenn Lewis (L) points something out to US President Barack Obama as they visit a tornado affected area on May 26, 2013 in Moore, Oklahoma. Obama is in the Oklahoma City area to survey damage from the tornado which struck a week ago and meet with victims and first responders. MANDEL NGAN/AFP/Getty Images ( 520093470 )

President Barack Obama waves to a group of armed forces personnel and several families affected by the May 20th tornado at Tinker Air Force Base as he departed from his visit to Moore, Okla. on Sunday May 23, 2013 in Oklahoma City. (AP Photo/Nick Oxford) ( Obama Oklahoma Tornado )

Marine One, carrying U.S. President Barack Obama, takes off from the South Lawn of the White House in Washington May 26, 2013. Obama was headed to Moore, Oklahoma, on Sunday to tour the town that was hammered last week by a powerful tornado that killed 24 people and injured hundreds. REUTERS/Joshua Roberts ( USA-TORNADOES/OBAMA )