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PHILADELPHIA, PA - SEPTEMBER 26: Pope Francis speaks as he visits the Festival of Families September 26, 2015 in Philadelphia, Pennsylvania. Pope Francis is in Philadelphia for the last leg of his six-day visit to the U.S. (Photo by Alex Wong/Getty Images)

PHILADELPHIA, PA - SEPTEMBER 26:  Pope Francis speaks as he visits the Festival of Families September 26, 2015 in Philadelphia, Pennsylvania. Pope Francis is in Philadelphia for the last leg of his six-day visit to the U.S.  (Photo by Alex Wong/Getty Images)