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Rich Brooks/CNN/File
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KCCI
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US President Barack Obama stands alongside Pope Francis during an arrival ceremony on the South Lawn of the White House in Washington, DC, September 23, 2015. More than 15,000 people packed the South Lawn for a full ceremonial welcome on Pope Francis' historic maiden visit to the United States. AFP PHOTO / MANDEL NGAN        (Photo credit should read MANDEL NGAN/AFP/Getty Images)
MANDEL NGAN/AFP/Getty Images
US President Barack Obama stands alongside Pope Francis during an arrival ceremony on the South Lawn of the White House in Washington, DC, September 23, 2015. More than 15,000 people packed the South Lawn for a full ceremonial welcome on Pope Francis' historic maiden visit to the United States. AFP PHOTO / MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
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Republican presidential candidate and Texas senator Ted Cruz speaks during the Iowa Faith and Freedom Coalition annual banquet and presidential forum  Monday June 22, 2015 in Des Moines, Iowa.
(Taylor Glascock for CNN)
Taylor Glascock for CNN
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Former Arkansas Gov. Mike Huckabee speaks during the third day of the Republican National Convention at the Tampa Bay Times Forum on August 29, 2012 in Tampa, Florida.
Win McNamee/Getty Image
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Former US Congressman Asa Hutchinson announces the findings and recommendations of the National School Shield Program at the National Press Club in Washington, DC, April 2, 2013. The NRA-backed National School Shield program on Tuesday unveiled recommendations to protect schools from instances of violence, including a model program to train and enable school personnel to carry firearms. Hutchinson was tasked by the National Rifle Association following the December shooting at an elementary school in Newtown, Connecticut to develop the recommendations to bolster school security. AFP PHOTO/Jim WATSON        (Photo credit should read JIM WATSON/AFP/Getty Images)
JIM WATSON/AFP/Getty Images
Former US Congressman Asa Hutchinson announces the findings and recommendations of the National School Shield Program at the National Press Club in Washington, DC, April 2, 2013. The NRA-backed National School Shield program on Tuesday unveiled recommendations to protect schools from instances of violence, including a model program to train and enable school personnel to carry firearms. Hutchinson was tasked by the National Rifle Association following the December shooting at an elementary school in Newtown, Connecticut to develop the recommendations to bolster school security. AFP PHOTO/Jim WATSON (Photo credit should read JIM WATSON/AFP/Getty Images)
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