President Barack Obama, left, is welcomed by Archbishop George Gaenswein, prefect of the papal household, as he arrives at the Vatican to meet Pope Francis, Thursday, March 27, 2014. Obama is the ninth president to make an official visit to the Vatican. His audience marks a change of pace for the president, who has devoted the past three days of a weeklong, four-country trip to securing European unity against Russia's aggressive posture toward Ukraine. (AP Photo/Alessandra Tarantino), APTOPIX