In this photo taken March 27, 2014, President Barack Obama meets with Pope Francis at the Vatican. When Pope Francis arrives in the United States, he will get an airport welcome that few world leaders have ever received: a plane-side greeting from President Barack Obama and his wife, Michelle. The extraordinary gesture on Sept. 22 is just the beginning of the pomp and protocol that will be on display as Washington welcomes the popular leader of the world’s 1.2 billion Roman Catholics and the head of Vatican City. (AP Photo/Pablo Martinez Monsivais)