NEW YORK, NY - SEPTEMBER 25: A woman walks past the Vatican flag as it is flown outside the United Nations headquarters on September 25, 2015 in New York City. Pope Francis is in New York on a two day visit and will carry out a number of engagements including a speech at the United Nations General-Assembly, a Papal motorcade through Central Park and a Mass at Madison Square Garden. (Photo by Carl Court/Getty Images)
Pope Francis in NYC
UN personnel take photos as Pope Francis arrives to greet the staff members at United Nations headquarters with Secretary General Ban Ki-moon Friday, Sept. 25, 2015. The pope will address the UN General Assembly later in the day. (AP Photo/Kevin Hagen, Pool)
Pope Francis Addresses The United Nations General Assembly
Pope Francis arrives to speak at the United Nations General Assembly in New York on September 25, 2015. AFP PHOTO / TIMOTHY A. CLARY
Pope Francis in NYC
NEW YORK, NY - SEPTEMBER 25: Pope Francis is shown on the screen as he enters the United Nations on September 25, 2015 at United Nations Headquarters in New York City. The Pope is on a six-day visit to the U.S., with stops in Washington, New York City and Philadelphia. (Photo by Andrew Renneisen/Getty Images)
Pope Francis in NYC
German Chancellor Angela Merkel arrives to hear Pope Francis speaks at the United Nations General Assembly in New York on September 25, 2015. AFP PHOTO / TIMOTHY A. CLARY
Pope Francis in NYC
Pope Francis waits to deliver a speech to the 70th session of the United Nations General Assembly on September 25, 2015, at UN headquarters in New York. AFP PHOTO/Dominick Reuter
Pope Francis in NYC
Pope Francis speaks during the 70th session of the United Nations General Assembly on September 25, 2015, at the United Nations in New York. AFP PHOTO / VINCENZO PINTO
Pope Francis in NYC
Family members of September 11 terrorist attacks victims wait for Pope Francis to arrive at the 9/11 memorial in New York on September 25, 2015. Pope Francis, who has built a wide global following for his reform-minded views, is on a five-day official visit to the US. AFP PHOTO/JEWEL SAMAD
Pope Francis in NYC
NEW YORK, NY - SEPTEMBER 25: Former New York City Mayor Rudy Giuliani, left, and his wife, Judith Giuliani, look at a candle on the South Pool at the World Trade Center on September 25, 2015 in New York City. Pope Francis is expected to visit the World Trade Center as part of his six-day trip to the United States. (Photo by Julio Cortez-Pool/Getty Images)
Pope Francis in NYC
NEW YORK, NY - SEPTEMBER 25: Roses placed by the mother of an architect who died during the Sept. 11 terrorists attacks are erected off his name on the edge of the South Pool at the World Trade Center on September 25, 2015 in New York City. Pope Francis is expected to visit the World Trade Center as part of his six-day trip to the United States. (Photo by Julio Cortez-Pool/Getty Images)
Pope Francis in NYC
NEW YORK, NY - SEPTEMBER 25: People wait at the Ground Zero south reflecting pool for Pope Francis who will attend an interfaith prayer service on September 25, 2015 in New York City. Francis is to visit Ground Zero following his address at the United Nations. (Photo by Spencer Platt/Getty Images)
Pope Francis in NYC
Pope Francis places a white rose on the names of the September 11 victims at the edge of the South Pool of the 9/11 memorial in New York on September 25, 2015. Pope Francis, who has built a wide global following for his reform-minded views, is on a five-day official visit to the US. AFP PHOTO/JEWEL SAMAD
Pope Francis in NYC
Pope Francis places a white rose on the names of the September 11 victims at the edge of the South Pool of the 9/11 memorial in New York on September 25, 2015. Pope Francis, who has built a wide global following for his reform-minded views, is on a five-day official visit to the US. AFP PHOTO/JEWEL SAMAD
Pope Francis in NYC
Pope Francis prays at the 9/11 memorial in New York on September 25, 2015. Pope Francis, who has built a wide global following for his reform-minded views, is on a five-day official visit to the US. AFP PHOTO/JEWEL SAMAD
Pope Francis in NYC
NEW YORK, NY - SEPTEMBER 25: Sunlight peaking through buildings lights up the spot where Pope Francis, bottom left, paused to pray at the South Pool at the World Trade Center during a visit to the 9/11 Memorial on September 25, 2015 in New York City. The Pope is on a six-day visit to the U.S., with stops in Washington, New York City and Philadelphia. (Photo by Julio Cortez-Pool/Getty Images)
Pope Francis in NYC
NEW YORK, NY - SEPTEMBER 25: Pope Francis prays at the edge of the South Pool at the World Trade Center on September 25, 2015 in New York City. The Pope is on a six-day visit to the U.S., with stops in Washington, New York City and Philadelphia. (Photo by Julio Cortez-Pool/Getty Images)
Pope Francis in NYC
NEW YORK, NY - SEPTEMBER 25: A woman looks on as Pope Francis prays the South Pool at the World Trade Center on September 25, 2015 in New York City. The Pope is on a six-day visit to the U.S., with stops in Washington, New York City and Philadelphia. (Photo by Julio Cortez-Pool/Getty Images)
Pope Francis in NYC
NEW YORK, NY - SEPTEMBER 25: Pope Francis (C), talks to a New York City police officer while visiting the South Pool at the World Trade Center on September 25, 2015 in New York City. The Pope is on a six-day visit to the U.S., with stops in Washington, New York City and Philadelphia. (Photo by Julio Cortez-Pool/Getty Images)
Pope Francis in NYC
Pope Francis attends a multi-religious service for the victims of 9/11, at the 9/11 Memorial in New York, on September 25, 2015. Pope Francis, who has built a wide global following for his reform-minded views, is on a five-day official visit to the US. AFP PHOTO / VINCENZO PINTO
Pope Francis in NYC
Pope Francis looks at Imam Khalid Latif, right, and Rabbi Elliot J. Cosgrove, left, shaking hands 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 in NYC
NEW YORK, NY - SEPTEMBER 25: Pope Francis speaks during a multi-religious prayer for peace at the 9/11 Memorial and Museum on September 25, 2015 in New York City. Pope Francis is in New York on a two day visit and will carry out a number of engagements including a Papal motorcade through Central Park and a Mass in Madison Square Garden. (Photo by Justin Sullivan/Getty Images)
Pope Francis in NYC
WASHINGTON, DC - SEPTEMBER 25: The Last Column (L), which was recovered from Ground Zero, is seen as Pope Francis attends a multi-religious service at the 9/11 Memorial and Museum on September 25, 2015 in New York City. Pope Francis is on a six-day trip to the United States, which includes stops in Washington DC, New York and Philadelphia. (Photo by Monika Graff-Pool/Getty Images)
Pope Francis in NYC
WASHINGTON, DC - SEPTEMBER 25: People take photos of Pope Francis during a multi-religious ceremony at the 9/11 Memorial and Museum on on September 25, 2015 in New York City. Pope Francis is on a six-day trip to the United States, which includes stops in Washington DC, New York and Philadelphia.(Photo by Ray Stubblebine-Pool/Getty Images)