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Mandatory Credit: Photo by AGF s.r.l./REX (3674764a) Pope Francis I and Barack Obama President Barack Obama official visit, The Vatican, Rome, Italy...

Mandatory Credit: Photo by AGF s.r.l./REX (3674764i) Pope Francis I and Barack Obama President Barack Obama official visit, The Vatican, Rome, Italy...

Mandatory Credit: Photo by AGF s.r.l./REX (3674764k) Pope Francis I and Barack Obama President Barack Obama official visit, The Vatican, Rome, Italy...

Mandatory Credit: Photo by AGF s.r.l./REX (3674764n) Pope Francis I and Barack Obama President Barack Obama official visit, The Vatican, Rome, Italy...

Mandatory Credit: Photo by AGF s.r.l./REX (3674764o) Pope Francis I and Barack Obama President Barack Obama official visit, The Vatican, Rome, Italy...

Mandatory Credit: Photo by AGF s.r.l./REX (3674764q) Pope Francis I and Barack Obama President Barack Obama official visit, The Vatican, Rome, Italy...

Mandatory Credit: Photo by AGF s.r.l./REX (3674764m) Pope Francis I and Barack Obama President Barack Obama official visit, The Vatican, Rome, Italy...

Mandatory Credit: Photo by AGF s.r.l./REX (3674764s) Pope Francis I and Barack Obama President Barack Obama official visit, The Vatican, Rome, Italy...

Mandatory Credit: Photo by Unimedia Images/REX (3674879a) Barack Obama and Pope Francis President Barack Obama official visit to Rome, Italy - 27 Ma...

Mandatory Credit: Photo by Unimedia Images/REX (3674879b) Barack Obama and Pope Francis President Barack Obama official visit to Rome, Italy - 27 Ma...

Pope Francis meets President Barack Obama at the Vatican Thursday, March 27, 2014. President Barack Obama is holding a historic first meeting with Pop...

U.S. President Barack Obama meets with Pope Francis, Thursday, March 27, 2014 at the Vatican. (AP Photo/Pablo Martinez Monsivais)

Pope Francis is flanked by President Barack Obama at the Vatican Thursday, March 27, 2014. President Barack Obama is holding a historic first meeting...

US President Barack Obama meets with Pope Francis, Thursday, March 27, 2014 at the Vatican. Obama called himself a "great admirer" of Pope Francis as...

US President Barack Obama, left, and Pope Francis shake hands during their exchange of gifts, Thursday, March 27, 2014 at the Vatican. (AP Photo/Pabl...

Pope Francis and President Barack Obama talk as they meet at the Vatican Thursday, March 27, 2014. President Barack Obama called himself a "great admi...

Pope Francis and President Barack Obama meet at the Vatican Thursday, March 27, 2014. President Barack Obama called himself a "great admirer" of Pope...

Pope Francis and President Barack Obama meet at the Vatican Thursday, March 27, 2014. President Barack Obama called himself a "great admirer" of Pope...

Pope Francis and President Barack Obama meet at the Vatican Thursday, March 27, 2014. President Barack Obama called himself a "great admirer" of Pope...

Pope Francis listens to President Barack Obama as they meet at the Vatican Thursday, March 27, 2014. President Barack Obama called himself a "great ad...

US President Barack Obama with Pope Francis, Thursday, March 27, 2014 at the Vatican. Obama called himself a "great admirer" of Pope Francis as he sat...

President Barack Obama meets with Pope Francis, Thursday, March 27, 2014, at the Vatican. Obama called himself a "great admirer" of Pope Francis as he...

President Barack Obama meets with Pope Francis, Thursday, March 27, 2014, at the Vatican. Obama called himself a "great admirer" of Pope Francis as he...

Pope Francis and President Barack Obama smile as they meet at the Vatican Thursday, March 27, 2014. A visibly energized President Barack Obama held a...

Pope Francis and President Barack Obama leave after meeting at the Vatican Thursday, March 27, 2014. A visibly energized President Barack Obama held a...

Pope Francis and President Barack Obama smile as they meet at the Vatican Thursday, March 27, 2014. A visibly energized President Barack Obama held a...

President Barack Obama meets with Pope Francis, Thursday, March 27, 2014, at the Vatican. Obama called himself a "great admirer" of Pope Francis as he...

President Barack Obama and Secretary of State John Kerry meet with Pope Francis, Thursday, March 27, 2014, at the Vatican. Obama called himself a "gre...

FILE -- Eugene Lee, a set designer, at his home studio in Providence, R.I., March 21, 2014. Lee, who won Tony Awards for "Wicked" and other shows whil...

Pope Francis (C) speaks with US President Barack Obama during a private audience on March 27, 2014 at the Vatican. The meeting at the Vatican comes as...

Pope Francis (R) speaks with US President Barack Obama during a private audience on March 27, 2014 at the Vatican. The meeting at the Vatican comes as...

Pope Francis (R) stands next to US President Barack Obama during a private audience on March 27, 2014 at the Vatican. The meeting at the Vatican comes...

Pope Francis (R) stands next to US President Barack Obama during a private audience on March 27, 2014 at the Vatican. The meeting at the Vatican comes...

Pope Francis (R) speaks with US President Barack Obama during a private audience on March 27, 2014 at the Vatican. The meeting at the Vatican comes as...

Pope Francis shakes hands with US President Barack Obama during a private audience on March 27, 2014 at the Vatican. The meeting at the Vatican comes...

Pope Francis (R) walks with US President Barack Obama during a private audience on March 27, 2014 at the Vatican. The meeting at the Vatican comes as...

Pope Francis and US President Barack Obama exchange gifts during a private audience on March 27, 2014 at the Vatican. The meeting at the Vatican comes...

Pope Francis (R) and US President Barack Obama laugh as they exchange gifts during a private audience on March 27, 2014 at the Vatican. The meeting at...

Pope Francis (L) speaks with US President Barack Obama during a private audience on March 27, 2014 at the Vatican. The meeting at the Vatican comes as...

Pope Francis (R) and US President Barack Obama laugh as they exchange gifts during a private audience on March 27, 2014 at the Vatican. The meeting at...

(FILES) In this file photo taken on March 25, 2014 German soldiers stand to attention in front of a German Patriot missile launcher at the Gazi barrac...

Mandatory Credit: Photo by AGF s.r.l./REX (3668148a) Pope Francis I and Don Ciotti Pope Francis Prays For Victims Of the Mafia, Rome, Italy - 21 Mar...

Mandatory Credit: Photo by AGF s.r.l./REX (3668148b) Pope Francis I and Don Ciotti Pope Francis Prays For Victims Of the Mafia, Rome, Italy - 21 Mar...

Mandatory Credit: Photo by AGF s.r.l./REX (3668148d) Pope Francis I and Don Ciotti Pope Francis Prays For Victims Of the Mafia, Rome, Italy - 21 Mar...

Mandatory Credit: Photo by AGF s.r.l./REX (3668148g) Pope Francis I and Don Ciotti during the civil prayer Pope Francis Prays For Victims Of the Maf...

Mandatory Credit: Photo by AGF s.r.l./REX (3668148h) Pope Francis I and Don Ciotti during the civil prayer Pope Francis Prays For Victims Of the Maf...

Mandatory Credit: Photo by AGF s.r.l./REX (3668148i) Pope Francis I and Don Ciotti during the civil prayer Pope Francis Prays For Victims Of the Maf...

Mandatory Credit: Photo by AGF s.r.l./REX (3668148j) Pope Francis I and Don Ciotti greet faithfuls Pope Francis Prays For Victims Of the Mafia, Rome...

Mandatory Credit: Photo by AGF s.r.l./REX (3668148k) Pope Francis I and Don Ciotti greet faithfuls Pope Francis Prays For Victims Of the Mafia, Rome...

Mandatory Credit: Photo by AGF s.r.l./REX (3668148l) Pope Francis I and Don Ciotti greet faithfuls Pope Francis Prays For Victims Of the Mafia, Rome...