Pope Francis prays in the Saint Mary Major Basilica in Rome to thank the Virgin Mary after his Mideast trip, May 27, 2014.

Pope Francis departs at Ben Gurion International Airport, May 26, 2014, in Tel Aviv, Israel.

Pope Francis is welcomed by Israel President Shimon Peres as they arrive in the official Presidential Residence in Jerusalem, May 26, 2014.

Pope Francis is flanked by Israeli President Shimon Peres as they plant an olive tree in the official Presidential Residence in Jerusalem, May 26, 2014.

Pope Francis rekindles the Eternal flame at the Hall of Remembrance at the Yad Vashem Holocaust memorial in Jerusalem, May 26, 2014.

Pope Francis lays a wreath at the Hall of Remembrance at the Yad Vashem Holocaust memorial in Jerusalem, May 26, 2014.

Pope Francis shakes hands Ashkenazi Chief Rabbi David Lau, at the Heichal Shlomo center in Jerusalem, Israel, May 26, 2014.

Pope Francis meets prelates, nuns and seminarists at the Church of Gethsemane, in Jerusalem, May 26, 2014.

Pope Francis celebrates a mass in the Church of the Cenacle, believed to be the site of the last supper, in Jerusalem, May 26, 2014.

Pope Francis prays at the Western Wall, the holiest place where Jews can pray, in the old city of Jerusalem, Israel, May 26, 2014.

Pope Francis arrives to meet prelates, nuns and seminarists at the Church of Gethsemane, in Jerusalem May 26, 2014.

Pope Francis delivers his speech as he meets prelates, nuns and seminarists at the Church of Gethsemane, in Jerusalem, May 26, 2014.

Pope Francis kisses the hand of holocaust survivor Sonia Tunik-Geron during a ceremony at the Hall of Remembrance in the Yad Vashem Holocaust memorial, in Jerusalem, May 26, 2014.

Pope Francis stops by a memorial to victims of terror in Jerusalem, with the names of Israeli civilians killed by terrorism engraved in marble, after laying a wreath on the tomb of Theodor Herzl, the founder of Zionism, in Jerusalem, May 26, 2014.

Pope Francis embraces Argentine Rabbi Abraham Skorka, center, and Omar Abboud, leader of Argentina's Muslim community, left, after praying at the Western Wall in Jerusalem's Old City, Israel, May 26, 2014. At right is Rabbi of the Western Wall Shmuel Rabinovitch.

In this photo provided by the Vatican newspaper L'Osservatore Romano, Pope Francis, center, arrives near the Dome of the Rock Mosque, in the Al Aqsa Mosque compound, also known to Jews as the Temple Mount, prior to a visit to the Western Wall Jerusalem, May 26, 2014.

Pope Francis and Israeli President Shimon Peres walk after their meeting in Jerusalem, May 26, 2014.

Israeli Prime Minister Benjamin Netanyahu meets Pope Francis in Jerusalem, May 26, 2014.

Pope Francis reads his message on the occasion of his meeting with the Mufti of Jerusalem Muhammad Ahmad Hussein, fourth from right, during their meeting in Jerusalem, May 26, 2014.

Pope Francis and Constantinople Patriarch Bartholomew hold hands at the end of a ceremony in the Church of the Holy Sepulcher, in Jerusalem, May 25, 2014.

Pope Francis and Constantinople Patriarch Bartholomew kneel to kiss the Stone of Unction, traditionally claimed as the stone where Jesus' body was prepared for burial, in the Church of the Holy Sepulchre, in Jerusalem, May 25, 2014.

Pope Francis, right, talks with Israeli President Shimon Peres, during an official arrival ceremony at Ben Gurion airport near Tel Aviv, Israel, Sunday, May 25, 2014.

In this photo provided by Vatican paper L'Osservatore Romano, Pope Francis visits the Nativity curch and site in the West Bank town of Bethlehem, May 25, 2014.

Pope Francis greets Israeli children after at the heliport of Hadassah hospital in Mount Scopus Jerusalem, May 25, 2014.

Pope Francis touches the wall that divides Israel from the West Bank, on his way to celebrate a mass in Manger Square next to the Church of the Nativity, believed by many to be the birthplace of Jesus Christ, in the West Bank town of Bethlehem, Sunday, May 25, 2014.

Pope Francis waves on his way to a mass in Manger Square next to the Church of the Nativity, traditionally believed to be the birthplace of Jesus Christ in the West Bank town of Bethlehem, May 25, 2014.

Pope Francis is welcomed by Palestinian President Mahmoud Abbas, left, upon his arrival to the West Bank city of Bethlehem, May 25, 2014.

Pope Francis prays in front of the river Jordan in Bethany beyond the Jordan river, the site of Christ's baptism, west of Amman, Jordan, Saturday, May 24, 2014.

Jordan's King Abdullah II (2nd R) walks with Pope Francis (L) in Amman, May 24, 2014.

Pope Francis meets King Abdullah II of Jordan, right, in Amman's Al Husseini Royal Palace, Jordan, Saturday, May 24, 2014.

Pope Francis celebrates a mass in Amman's International Stadium, Jordan, Saturday, May 24, 2014.

Pope Francis celebrates a mass in Amman's International Stadium, Jordan, Saturday, May 24, 2014.

A young girl holds a photo of Pope Francis and Jordan's King Abdullah II as Jordanians and Christians from various nationalities and denominations congregate at Amman's International Stadium waiting for the arrival of Pope Francis where he will conduct a mass prayer, in Amman, Jordan, Saturday, May 24, 2014.

Pope Francis is welcomed upon his arrival in Amman, Jordan, Saturday, May 24, 2014.