WASHINGTON, DC - SEPTEMBER 23:  Pope Francis speaks to bishops during the midday prayer service at the Cathedral of St. Matthew on September 23, 2015 in Washington, DC. The Pope began his first trip to the United States at the White House followed by a visit to St. Matthew's Cathedral, and will then hold a Mass on the grounds of the Basilica of the National Shrine of the Immaculate Conception.  (Photo by Mark Wilson/Getty Images)