US President Barack Obama (C) and Palestinian President Mahmoud Abbas (R) meet Palestinian children during Obama's visit to the Church of the Nativity in the West Bank city of Bethlehem, March 22, 2013. (Xinhua/Atef Safadi)

US President Barack Obama meets Palestinian children during his visit to the Church of the Nativity in the West Bank city of Bethlehem, March 22, 2013. (Xinhua/Atef Safadi)

Palestinian protesters conflict with police during a demonstration against Obama's visit in the West Bank city of Bethlehem, on March 22, 2013. (Xinhua/Luay Sababa)

U.S. President Barack Obama (front R) shakes hands with Palestinian President Mahmoud Abbas during his visit to the Church of the Nativity,in the West Bank city of Bethlehem, on March 22, 2013. (Xinhua/POOL)

Palestinian protesters conflict with police during a demonstration against Obama's visit in the West Bank city of Bethlehem, on March 22, 2013. (Xinhua/Luay Sababa)