PHOTOS: Pope Francis in the United States

A Pennsylvania State Police officer, left, stops to receives communion during Mass celebrated by Pope Francis on the Benjamin Franklin Parkway in Philadelphia, Sunday, Sept. 27. (AP Photo/Pablo Martinez Monsivais)

Pope Francis holds the Gospel Book during a Mass on the Benjamin Franklin Parkway, Sunday, Sept. 27, 2015, in Philadelphia. (AP Photo/Alessandra Tarantino)

Pope Francis stops to kiss an unidentified child as he parades in the pope mobile on his way to celebrate Sunday Mass on the Benjamin Franklin Parkway in Philadelphia. (AP Photo/Pablo Martinez Monsivais)

A nun from The Sisters of Life, of New York City, is inspected at a security checkpoint as she arrives for a Mass to be celebrated by Pope Francis, Sunday, Sept. 27, 2015. (AP Photo/John Minchillo)

Doug and Julie Bauman, teachers at St. Barnabas Catholic School in Indianapolis, Ind., wear their homemade Papal Mitres in Philadelphia, Sunday, Sept. 27, 2015. (AP Photo/Carolyn Kaster)

Pope Francis greets seminarians as he walks the loggia to his address to the Bishops at St. Martin of Tours Chapel at St.Charles Borromeo Seminary, Sunday, Sept. 27, 2015. (Tom Gralish/The Philadelphia Inquirer, Pool)

People react as Pope Francis greets them from the pope mobile during a parade as he visits the Festival of Families in Philadelphia on Sept. 26, 2015. (Alex Wong/Pool Photo via AP)

Pope Francis makes his way to the Festival of Families along Benjamin Franklin Parkway in Philadelphia on Sept. 26, 2015. (Jewel Samad/Pool Photo via AP)

The wind lifts Pope Francis' mantle as he delivers his speech in front of Independence Hall, Saturday, Sept. 26, 2015, in Philadelphia. (Tony Gentile/Pool Photo via AP)

Pope Francis, center, is greeted by Bishop Timothy Senior, center right, and seminarians as he arrives at St. Charles Borromeo Seminary Saturday, Sept. 26, 2015. (AP Photo/Mel Evans)

Nuns watch Pope Francis on a television screen as he makes his way through the chapel at Cathedral Basilica of Sts. Peter and Paul after a Mass, Saturday, Sept. 26, 2015. (AP Photo/Julio Cortez)

Pope Francis processes toward the altar at Cathedral Basilica of Sts. Peter and Paul during a Mass, Saturday, Sept. 26, 2015, in Philadelphia. (AP Photo/Julio Cortez)

Pope Francis kisses and blesses Michael Keating, 10, of Elverson, Pa. after arriving in Philadelphia. (Joseph Gidjunis/World Meeting of Families via AP)

People hold up images of the Virgin Mary with Baby Jesus and a crucifix as they crowd into Independence Mall. (AP Photo/Carolyn Kaster)

Pope Francis listens to the readings while celebrating Mass at Madison Square Garden, Friday, Sept. 25, 2015, in New York. (AP Photo/Julie Jacobson, Pool)

Pope Francis greets the faithful as he arrives at Our Lady Queen of Angels School, Friday, Sept. 25, 2015, in New York. (AP Photo/Jason DeCrow)

People wait for the arrival of Pope Francis at the Sept. 11 Memorial Museum on Friday, Sept. 25, 2015, in New York. (AP Photo/Adam Hunger)

Pope Francis waives to the faithful as he leaves Our Lady Queen of Angels School, Friday, Sept. 25, 2015, in New York. (AP Photo/Jason DeCrow)

Pope Francis visits the 9/11 Museum, Friday, Sept. 25, 2015 in New York. (Susan Watts/New York Daily News via AP, Pool)

Pope Francis, second left, reads a passage during a multi-religious service at the 9/11 Museum, Friday, Sept. 25, 2015 in New York City. (Monica Graff/Pool via AP)

Pope Francis greets Gunisha Kaur, member of Sikh community, as he arrives for an interfaith service at the Sept. 11 memorial museum in New York, Friday Sept. 25, 2015. (AP Photo/Alessandra Tarantino)

Pope Francis places a white rose at the South Pool of the 9/11 Memorial in downtown Manhattan, Friday, Sept. 25, 2015, in New York. (AP Photo/John Minchillo)

Pope Francis arrives to address the 70th session of the United Nations General Assembly, Friday, Sept. 25, 2015 at United Nations headquarters. (AP Photo/Mary Altaffer)

Pope Francis arrives in front of United Nations headquarters with Secretary General Ban Ki-moon Friday, Sept. 25, 2015. (AP Photo/Kevin Hagen, Pool)

Pope Francis leads an evening prayer service at St. Patrick's Cathedral, Thursday, Sept. 24, 2015, in New York. (Robert Deutsch/USA Today via AP)

Pope Francis is greeted by New York City Mayor Bill DeBlasio, right, Sen. Charles Schumer, center, and New York Gov. Andrew Cuomo as he arrives at St. Patrick's Cathedral. (AP Photo/Julie Jacobson)

Pope Francis waves as he arrives at St. Patrick's Cathedral to lead an evening prayer service, Thursday, Sept. 24, 2015, in New York. (AP Photo/Julie Jacobson)

Pope Francis kisses Maria Teresa Heyer, a 1st grade student from the Brooklyn borough of New York, as the pope is greeted by Heyer and other students at JFK Airport. (AP Photo/Craig Ruttle, Pool)

Pope Francis engages well-wishers as he kisses a child after arriving at John F. Kennedy International Airport Thursday, Sept. 24, 2015, in New York. (AP Photo/Craig Ruttle, Pool)

Pope Francis has a selfie taken with Cartrice Haynesworth as he walks through the crowd during a visit to Catholic Charities of the Archdiocese of Washington. (AP Photo/David Goldman, Pool)

Pope Francis speaks to the crowd from the Speaker's Balcony on Capitol Hill, Thursday, Sept. 24, 2015, after his address to a joint meeting of Congress. (AP Photo/Susan Walsh)

Members of the House and Senate applause as Pope Francis begins his address before a joint meeting of Congress on Capitol Hill in Washington, Thursday, Sept. 24, 2015. (AP Photo/Carolyn Kaster)

Pope Francis, accompanied by Vice President Joe Biden and House Speaker John Boehner of Ohio, blesses an unidentified child on Capitol Hill in Washington, Thursday, Sept. 24, 2015, (Michael Reynolds/Pool Photo via AP)

House Speaker John Boehner of Ohio meets with Pope Francis on Capitol Hill in Washington, Thursday, Sept. 24, 2015, as the Pope arrived before addressing a joint meeting. (Bill Clark/Roll Call/ via AP, Pool)

Pope Francis arrives in a Fiat 500L on Capitol Hill in Washington, Thursday, Sept. 24, 2015, for a speech before a joint meeting of Congress. (AP Photo/Steve Helber)

Pope Francis hugs a young boy while greeting school children before his departure from the Apostolic Nunciature. (AP Photo/Cliff Owen)

Pope Francis turns to face the congregation as he arrives inside the Basilica of the National Shrine of the Immaculate Conception in Washington, Wednesday, Sept. 23, 2015. (AP Photo/David Goldman)

Pope Francis holds an outdoor Mass at the Basilica of the National Shrine of the Immaculate Conception in Washington, Wednesday, Sept. 23, 2015, to canonize Junipero Serra. (Tony Gentile/Pool Photo via AP)

People cheer before a parade for Pope Francis, Wednesday, Sept. 23, 2015, in Washington. (AP Photo/Alex Brandon, Pool)

Pope Francis give the thumbs-up from the popemobile during a parade around the Ellipse near the White House in Washington. (AP Photo/Carolyn Kaster)

Pope Francis reaches from the popemobile for a child that is brought to him, during a parade in Washington, Wednesday, Sept. 23, 2015. (AP Photo/Alex Brandon, Pool)

President Barack Obama talks with Pope Francis in the Oval Office of the White House in Washington, Wednesday, Sept. 23, 2015. (AP Photo/Andrew Harnik)

President Barack Obama shakes hands with Pope Francis after this welcoming speech during the state arrival ceremony on the South Lawn of the White House. (AP Photo/Pablo Martinez Monsivais)

Pope Francis shakes hands with school children as he departs the Apostolic Nunciature, the Vatican's diplomatic mission in Washington, Wednesday, Sept. 23, 2015. (AP Photo/Cliff Owen)

Pope Francis waves from a Fiat 500L as his motorcade departs Andrews Air Force Base, Md., Tuesday, Sept. 22, 2015, after being greeted by President Barack Obama. (AP Photo/Andrew Harnik)

President Barack Obama and first lady Michelle Obama greet Pope Francis upon his arrival at Andrews Air Force Base, Md., Tuesday, Sept. 22, 2015. (AP Photo/Andrew Harnik)

Pope Francis walks down the steps of his plane upon his arrival at Andrews Air Force Base, Md., Tuesday, Sept. 22, 2015, where President Barack Obama was to greet him. (AP Photo/Andrew Harnik)