Pope Francis waves from the top of the stairs of his plane at the airport in Santiago, Cuba, Tuesday Sept. 22, 2015. (AP Photo/Enric Marti)
Pope Francis leads Mass at the sanctuary of the Virgin of Charity, or Our Lady of El Cobre, in El Cobre, Cuba, Tuesday, Sept. 22, 2015. (Ismael Francisco/Cubadebate via AP)
Pope Francis speaks to people gathered outside the Metropolitan Cathedral in Santiago de Cuba, Cuba, Tuesday, Sept. 22, 2015. (AP Photo/Eduardo Verdugo)
Security surrounds Pope Francis' popemobile as he makes his way to the Metropolitan Cathedral to celebrate Mass in Santiago de Cuba, Cuba, Tuesday, Sept. 22, 2015. (AP Photo/Eduardo Verdugo)
Pope Francis kisses a child as he arrives at the Metropolitan Cathedral to celebrate Mass in Santiago de Cuba, Cuba, Tuesday, Sept. 22, 2015. (AP Photo/Eduardo Verdugo)
Pope Francis talks with a group of children in the sanctuary of the Virgin of Charity of Cobre, in El Cobre, Cuba, Monday, Sept. 21, 2015. (Tony Gentile/Pool via AP)
Pope Francis waves from his popemobile as he travels to the Plaza of the Revolution to celebrate Mass in Holguin, Cuba, Monday, Sept. 21, 2015. (Enrique De La Osa/Pool via AP)
Pope Francis waves from his popemobile as he travels to the Plaza of the Revolution to celebrate Mass in Holguin, Cuba, Monday, Sept. 21, 2015. (Enrique De La Osa/Pool via AP)
Pope Francis waves from his popemobile as he travels to the Plaza of the Revolution to celebrate Mass in Holguin, Cuba, Monday, Sept. 21, 2015. (Enrique De La Osa/Pool via AP)
Cuba's President Raul Castro applauds as Pope Francis arrives at the Plaza of the Revolution to celebrate a Mass, in Holguin, Cuba, Monday, Sept. 21, 2015. (AP Photo/Alessandra Tarantino)
Pope Francis approaches the altar with his pastoral staff to celebrate Mass at the Plaza of the Revolution, in Holguin, Cuba, Monday, Sept. 21, 2015. (AP Photo/Alessandra Tarantino)
Pope Francis approaches the altar to deliver Mass at the Plaza of the Revolution, in Holguin, Cuba, Monday, Sept. 21, 2015. (AP Photo/Alessandra Tarantino)
Pope Francis circles the altar with incense during a Mass in the Plaza of the Revolution, in Holguin, Cuba, Monday, Sept. 21, 2015. (AP Photo/Alessandra Tarantino)
Pope Francis and Cuba's Fidel Castro shakes hands, in Havana, Cuba, Sunday, Sept. 20, 2015. (AP Photo/Alex Castro)
Pope Francis blesses the Virgin del Charity, also known as Our Lady of El Cobre, as he celebrates Mass at Revolution Plaza in Havana, Cuba, Sunday, Sept. 20, 2015. (Ismael Francisco/Cubadebate Via AP)
Pope Francis celebrates Mass at Revolution Plaza in Havana, Cuba, Sunday, Sept. 20, 2015. (AP Photo/Desmond Boylan)
Pope Francis holds his pastoral staff as he arrives to celebrate Mass in Revolution Square in Havana, Cuba, Sunday, Sept. 20, 2015. (Tony Gentile/POOL via AP)
Pope Francis holds his pastoral staff after arriving for Mass at Revolution Plaza in Havana, Cuba, Sunday, Sept. 20, 2015, where a Cuban flag decorates a nearby building. (AP Photo/Alessandra Tarantino)
Pope Francis celebrates Mass in Revolution Square in Havana, Cuba, Sunday, Sept. 20, 2015. (Tony Gentile/POOL via AP)
Pope Francis is helped to the altar as he arrives to celebrate Mass in Revolution Square in Havana, Cuba, Sunday, Sept. 20, 2015. (Tony Gentile/POOL via AP)
Pope Francis arrives for Mass at Revolution Plaza in Havana, Cuba, Sunday, Sept. 20, 2015. (AP Photo/Desmond Boylan)
Pope Francis arrives for Mass at Revolution Plaza in Havana, Cuba, Sunday, Sept. 20, 2015. (AP Photo/Ramon Espinosa)
A chorus sings as Pope Francis arrives for Mass at Revolution Plaza in Havana, Cuba, Sunday, Sept. 20, 2015. (AP Photo/Alessandra Tarantino)
Pope Francis waves accompanied by Havana Cardinal Jaime Lucas Ortega y Alamino as he arrives to the Apostolic Nunciature in Havana, Cuba, Saturday, Sept. 19, 2015. (AP Photo/Alessandra Tarantino)
Pope Francis waves to people from his popemobile as he arrives to the Apostolic Nunciature in Havana, Cuba, Saturday, Sept. 19, 2015. (AP Photo/Alessandra Tarantino)
Pope Francis blesses a girl as Cuba's President Raul Castro looks on after landing at the airport in Havana, Cuba, Saturday, Sept. 19, 2015. (Ismael Francisco/Cubadebate Via AP)
Pope Francis' robe is lifted by the wind at the podium during his arrival ceremony in Havana, Cuba, Saturday, Sept. 19, 2015. (Ismael Francisco/Cubadebate Via AP)
Pope Francis' cap flies off his head as he deplanes in Havana, Cuba, Saturday, Sept. 19, 2015. (AP Photo/Ismael Francisco, Cubadebate Via AP)
Soldiers march inside the airport during the arrival ceremony for Pope Francis in Havana, Cuba, Saturday, Sept. 19, 2015. (Ismael Francisco/Cubadebate Via AP)
A member of Cuba's church leadership kisses Pope Francis' hand as President Raul Castro stands by during the pope's arrival ceremony in Havana, Cuba, Saturday, Sept. 19, 2015. (AP Photo/Ramon Espinosa)
Cuba's President Raul Castro, right, escorts Pope Francis during the pope's arrival ceremony at the airport in Havana, Cuba, Saturday, Sept. 19, 2015. (AP Photo/Ramon Espinosa)
Cuba's President Raul Castro escorts Pope Francis during the pope's arrival ceremony at the airport in Havana, Cuba, Saturday, Sept. 19, 2015. (AP Photo/Ramon Espinosa)
Pope Francis speaks with Cuba's President Raul Castro during his arrival ceremony at the airport in Havana, Cuba, Saturday, Sept. 19, 2015. (AP Photo/Ramon Espinosa)
The wind begins the lift Pope Francis' cap as he deplanes at the airport in Havana, Cuba, Saturday, Sept. 19, 2015. (AP Photo/Ramon Espinosa)
The wind carries away Pope Francis' cap as he deplanes in Havana, Cuba, Saturday, Sept. 19, 2015. (AP Photo/Ramon Espinosa)
Pope Francis sits as Cuba's President Raul Castro stands at right during his arrival ceremony at the airport in Havana, Cuba, Saturday, Sept. 19, 2015. (AP Photo/Ramon Espinosa)
Surrounded by security and government press, Pope Francis walks with Cuba's President Raul Castro as he arrives to the airport in Havana, Cuba, Saturday, Sept. 19, 2015. (AP Photo/Ramon Espinosa)
Pope Francis spent four days in Cuba ahead of his trip to the United States.