NEWSPope Francis visits PhiladelphiaAretha Franklin performs at the Festival of Families as Pope Francis looks on September 26, 2015 in Philadelphia, Pennsylvania. Pope Francis wraps up his trip to the United States with two days in Philadelphia, attending the Festival of Families and meeting with prisoners at the Curran-Fromhold Correctional Facility.Carl Court, Getty ImagesPope Francis waves to the crowd during a parade Saturday, Sept. 26, 2015, in Philadelphia. The pontiff attended a music-and-prayer festival there Saturday night to close out the World Meeting of Families, a Vatican-sponsored conference of more than 18,000 people from around the world.Matt Rourke, APPope Francis makes his way to the Festival of Families along Benjamin Franklin Parkway in Philadelphia on Sept. 26, 2015.Eric Thayer, The New York Times Via APBenjamin Franklin Parkway in Philadelphia is lit up at dusk and lined with tens of thousands of people as Pope Francis makes his way along the thoroughfare, Saturday, Sept. 26, 2015.Michael Perez, APPope Francis holds his cap to keep it from blowing off as he delivers his speech in front of Independence Hall, Saturday, Sept. 26, 2015, in Philadelphia.Tony Gentile, APColleen Feldmann, of Fallsington, Pa., center, and Sister Donna with Missionaries of Charity in India, right, cheer as Pope Francis arrives at the Cathedral Basilica of Saints Peter and Paul Saturday, Sept. 26, 2015, in Philadelphia.David Goldman, APMembers of a choir file into the Cathedral Basilica of Sts. Peter and Paul in Philadelphia, Saturday, Sept. 26, 2015, before a Mass with Pope Francis.Patrick Semansky, APPeggy Scott (center) dances to the band Sister Sledge while waiting for Pope Francis to arrive at the World Meeting of Families at Benjamin Franklin Parkway on September 26, 2015 in Philadelphia, Pennsylvania.Andrew Burton, Getty ImagesPope Francis makes his way to the World Meeting of Families festival along Benjamin Franklin Parkway in Philadelphia on Saturday, Sept. 26, 2015.Jewel Samad, APAmerican singer Aretha Franklin sings as Pope Francis and others listen during the World Meeting of Families festival in Philadelphia, Saturday, Sept. 26, 2015.Tony Gentile, APPope Francis embraces a young man in a wheelchair during the World Meeting of Families in the Benjamin Franklin Parkway Saturday, Sept. 26, 2015, in Philadelphia.Alessandra Tarantino, APA woman arrives at Cathedral Basilica of Sts. Peter and Paul before a Mass given by Pope Francis, Saturday, Sept. 26, 2015, in Philadelphia.Julio Cortez, APPope Francis greets the crowd as he travels to the Festival of Families on September 26, 2015 in Philadelphia.Jewel Samad-Pool/Getty ImagesThousands of spectators watch a video feed of Pope Francis during the Festival of Families on September 26, 2015 in Philadelphia.Justin Sullivan, Getty ImagesAttendees rejoice as Pope Francis greets them from the pope mobile during a parade as he visits the Festival of Families September 26, 2015 in Philadelphia, Pennsylvania.Alex Wong, Getty ImagesPope Francis (C) is greeted on stage as he visits the Festival of Families September 26, 2015 in Philadelphia, Pennsylvania.Alex Wong, Getty ImagesPope Francis speaks during the Festival of Families on September 26, 2015 in Philadelphia.Carl Court, Getty ImagesAretha Franklin performs as Pope Francis is seated nearby at the Festival of Families on September 26, 2015 in Philadelphia, Pennsylvania.Matt Slocum - Pool/Getty ImagesA man applauds after Pope Francis finishes speaking at the World Meeting of Families at Benjamin Franklin Parkway on September 26, 2015 in Philadelphia.Andrew Burton, Getty ImagesPeople watch a telecast of Pope Francis speaking at the World Meeting of Families at Benjamin Franklin Parkway on September 26, 2015 in Philadelphia, Pennsylvania.Andrew Burton, Getty Images