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Pope Francis speaks during arrival ceromonies with US President Barack Obama at the White House on September 23, 2015 in Washington,DC. President Barack Obama hosts Pope Francis at the White House for the first time Wednesday, warmly embracing the Catholic pontiff seen as both a moral authority and potent political ally. AFP PHOTO / VINCENZO PINTO (Photo credit should read VINCENZO PINTO/AFP via Getty Images)

Pope Francis speaks during arrival ceromonies with US President Barack Obama at the White House on September 23, 2015 in Washington,DC. President Barack Obama hosts Pope Francis at the White House for the first time Wednesday, warmly embracing the Catholic pontiff seen as both a moral authority and potent political ally.  AFP PHOTO / VINCENZO PINTO        (Photo credit should read VINCENZO PINTO/AFP via Getty Images)