Pope Francis give the thumbs-up from the popemobile during a parade around the Ellipse near the White House in Washington, Wednesday, September 23, 2015. (Photo by Carolyn Kaster/AP Photo)





People wait on a taxi line near Madison Square Garden, Wednesday, September 23, 2015, as a 225-foot-tall hand-painted billboard of Pope Francis stands out at Eighth Avenue in New York. The billboard, designed by Israel Ochoa of DeSales Media, including a photo by photographer Giulio Napolitano, marks the arrival of the pope Thursday. (Photo by Craig Ruttle/AP Photo)





Guests show their excitement as they wait in viewing pens to see Pope Francis emerge from a private meeting with U.S. President Barack Obama upon the Pope's arrival at Joint Base Andrews outside Washington September 22, 2015. (Photo by Jonathan Ernst/Reuters)





A nun holds a U.S. flag during an arrival ceremony for Pope Francis at the White House in Washington September 23, 2015. The pontiff is on his first visit to the United States. (Photo by Kevin Lamarque/Reuters)





Pope Francis holds a prayer meeting with the U.S. bishops at Saint Matthew’s Cathedral in Washington, September 23, 2015. (Photo by Mary F. Calvert/Reuters)





A street musician plays religious music with a doll wearing t-shirt with greetings for Pope Francis in Washington September 23, 2015. (Photo by Yuri Gripas/Reuters)





A man walks past greetings for Pope Francis near the White House in Washington September 23, 2015. (Photo by Yuri Gripas/Reuters)





A newspaper vendor sells portraits of Pope Francis near the White House in Washington September 23, 2015. (Photo by Yuri Gripas/Reuters)





A couple walks along a street after greeting Pope Francis in Washington September 23, 2015. (Photo by Yuri Gripas/Reuters)





Tracy Pineda from Mexico wears a headband after greeting Pope Francis outside Saint Matthew's Cathedral in Washington September 23, 2015. (Photo by Yuri Gripas/Reuters)





Protesters block a street outside Saint Matthew's Cathedral in Washington during Pope Francis' prayer meeting with U.S. bishops, September 23, 2015. (Photo by Yuri Gripas/Reuters)





A woman climbs on a light stand for a better view Pope Francis arrival at Saint Matthew's Cathedral in Washington September 23, 2015. (Photo by Yuri Gripas/Reuters)





Protesters block a street outside Saint Matthew's Cathedral in Washington during Pope Francis' prayer meeting with U.S. bishops, September 23, 2015. (Photo by Yuri Gripas/Reuters)





Pope Francis waves from the popemobile during a papal parade in Washington September 23, 2015. (Photo by Alex Brandon/Reuters)





Sister Marie of Washington passes through security before Pope Francis holds the Canonization Mass for Friar Junipero Serra at the Basilica of the National Shrine of the Immaculate Conception in Washington September 23, 2015. (Photo by Brian Snyder/Reuters)





Pope Francis, left, greets children as he is escorted by President Barack Obama, center, and first lady Michelle Obama, right, after arriving at Andrews Air Force Base, Md., Tuesday, September 22, 2015. The Pope is spending three days in Washington before heading to New York and Philadelphia. This is the Pope's first visit to the United States. (Photo by Susan Walsh/AP Photo)





Souvenirs of Pope Francis are sold across the street from the Cathedral Basilica of Saints Peter and Paul, the first site the pontiff will visit in Philadelphia, Pennsylvania, September 23, 2015. The events expected to draw the biggest crowds during Pope Francis' six-day visit to the United States all occur in Philadelphia, September 26-27. (Photo by Mark Makela/Reuters)





A pilgrim attending the World Meeting of Families signs a poster drawing of Pope Francis, by artist Mark Gaines, in Philadelphia, Pennsylvania, September 23, 2015. (Photo by Mark Makela/Reuters)





Members of the public watch as Pope Francis (not pictured) presides over a Canonization Mass for Friar Serra at the Basilica of the National Shrine of the Immaculate Conception in Washington September 23, 2015. (Photo by Kevin Lamarque/Reuters)





Pope Francis dispenses incense while celebrating Mass at the National Shrine of the Immaculate Conception for the Canonization Mass for Friar Junipero Serra in Washington September 23, 2015. (Photo by Kevin Lamarque/Reuters)





Nuns leans out to see Pope Francis as he greets and blesses seminarians, novices and religious guests inside the Basilica of the National Shrine of the Immaculate Conception in Washington September 23, 2015. (Photo by Jim Bourg/Reuters)





A banner of Pope Francis hangs from a streetlamp as pedestrians walk on the Benjamin Franklin Parkway at dusk, with final preparations continuing for the papal visit in Philadelphia, Pennsylvania, September 23, 2015. (Photo by Mark Makela/Reuters)





Pope Francis figurines are seen on a window display in Philadelphia, Pennsylvania, September 23, 2015. Pope Francis will travel to Philadelphia in his six-day visit to the United States. (Photo by Mark Makela/Reuters)





School children await Pope Francis' departure from the Vatican Embassy in Washington on day three of his first visit to the United States September 24, 2015. Fresh off his meeting with President Barack Obama, Pope Francis delivers a speech on Thursday to a U.S. Congress led by Republicans who have opposed Obama on issues of importance to the pontiff including climate change and immigration. (Photo by Gary Cameron/Reuters)