In this handout image supplied by the Government Press Office of Israel (GPO) Israeli Prime Minister Benjamin Netanyahu (R) and U.S. President Barack Obama visit the shrine of the book on March 21, 2013 in Jerusalem, Israel.
- [GPO/AFP/Getty Images]

US President Barack Obama (L) greets Israeli Prime Minister Benjamin Netanyahu during a press conference on March 20, 2013 in Jerusalem, Israel. This is Obama's first visit as President to the region, and his itinerary will include meetings with the Palestinian and Israeli leaders as well as a visit to the Church of the Nativity in Bethlehem.
- [Lior Mizrahi/AFP/Getty Images]

In this handout image supplied by the Government Press Office of Israel (GPO) Israeli Prime Minister Benjamin Netanyahu (C, R) hosts US President Barack Obama at a dinner on March 21, 2013 in Jerusalem, Israel.
- [GPO/AFP/Getty Images]

US President Barack Obama (R) and Palestinian President Mahmoud Abbas (L) review the honour guard during an official arrival ceremony at the Muqata, the Palestinian Authority headquarters in the West Bank city of Ramallah, on March 21, 2013.
- [SAUL LOEB/AFP/Getty Images]

Palestinian protestors hold signs during a demonstration against the visit of US President Barack Obama to the West Bank city of Ramallah on March 21, 2013. Obama arrived in the West Bank to a more prickly welcome from Palestinian leaders than the warm embrace he won in Israel the day before.
- [ABBAS MOMANI/AFP/Getty Images]

US President Barack Obama during an official welcoming ceremony on his arrival at Ben Gurion International Airport on March, 20, 2013 near Tel Aviv, Israel. This will be Obama's first visit as President to the region, and his itinerary will include meetings with the Palestinian and Israeli leaders as well as a visit to the Church of the Nativity in Bethlehem.
- [Uriel Sinai/AFP/Getty Images]

US President Barack Obama shakes hands with Israeli Prime Minister Benjamin Netanyahu during an official welcoming ceremony on his arrival at Ben Gurion International Airport on March, 20, 2013 near Tel Aviv, Israel. This will be Obama's first visit as President to the region, and his itinerary will include meetings with the Palestinian and Israeli leaders as well as a visit to the Church of the Nativity in Bethlehem.
- [Uriel Sinai/AFP/Getty Images]

US President Barack Obama shakes hands with Israeli Prime Minister Benjamin Netanyahu during an official welcoming ceremony on his arrival at Ben Gurion International Airport on March, 20, 2013 near Tel Aviv, Israel. This will be Obama's first visit as President to the region, and his itinerary will include meetings with the Palestinian and Israeli leaders as well as a visit to the Church of the Nativity in Bethlehem.
- [Uriel Sinai/AFP/Getty Images]

US President Barack Obama is greeted by Israeli Prime Minister Benjamin Netanyahu during an official welcoming ceremony on his arrival at Ben Gurion International Airport on March, 20, 2013 near Tel Aviv, Israel. This will be Obama's first visit as President to the region, and his itinerary will include meetings with the Palestinian and Israeli leaders as well as a visit to the Church of the Nativity in Bethlehem.
- [Uriel Sinai/AFP/Getty Images]

US President Barack Obama (C) talks with Israeli President Shimon Peres (L) and Israeli Prime Minister Benjamin Netanyahu (R) during an official welcoming ceremony on his arrival at Ben Gurion International Airport on March, 20, 2013 near Tel Aviv, Israel. This will be Obama's first visit as President to the region, and his itinerary will include meetings with the Palestinian and Israeli leaders as well as a visit to the Church of the Nativity in Bethlehem.
- [Uriel Sinai/AFP/Getty Images]

In this handout image supplied by the Government Press Office of Israel (GPO), US President Barack Obama is welcomed by Israeli President Shimon Peres and Israeli President Benjamin Nethanyahu at Ben Gurion International Airport on March 20, 2013 near Tel Aviv, Israel. This will be Obama's first visit as President to the region, and his itinerary will include meetings with the Palestinian and Israeli leaders as well as a visit to the Church of the Nativity in Bethlehem.
- [GPO/AFP/Getty Images]

US President Barack Obama (C), Israeli President Shimon Peres (L) and Prime Minister Benjamin Netanyahu (R) take part in an arrival ceremony for Obama at Ben Gurion International Airport on March 20, 2013. Obama landed in Israel for the first time as US president, on a mission to ease past tensions with his hosts and hoping to paper over differences on handling Iran's nuclear threat.
- [MANDEL NGAN/AFP/Getty Images]

US President Barack Obama speaks during an official welcoming ceremony on his arrival at Ben Gurion International Airport on March, 20, 2013 near Tel Aviv, Israel. This will be Obama's first visit as President to the region, and his itinerary will include meetings with the Palestinian and Israeli leaders as well as a visit to the Church of the Nativity in Bethlehem.
- [Uriel Sinai/AFP/Getty Images]

US President Barack Obama walks past an Israeli honour guard on his arrival at Ben Gurion Airport on March, 20, 2013 near Tel Aviv, Israel. This will be Obama's first visit as President to the region, and his itinerary will include meetings with the Palestinian and Israeli leaders as well as a visit to the Church of the Nativity in Bethlehem.
- [Uriel Sinai/AFP/Getty Images]

In this handout image supplied by the Government Press Office of Israel (GPO), US President Barack Obama (7th R) and Israeli President Benjamin Nethanyahu pose with members of the military in front of a missile launcher, at Ben Gurion International Airport on March 20, 2013 near Tel Aviv, Israel. This will be Obama's first visit as President to the region, and his itinerary will include meetings with the Palestinian and Israeli leaders as well as a visit to the Church of the Nativity in Bethlehem.
- [Handout/AFP/Getty Images]

US President Barack Obama and Israeli President Shimon Peres arrive for a press conference following their bilateral meeting at Peres' residence in Jerusalem on March 20, 2013.
- [MANDEL NGAN/AFP/Getty Images]

US President Barack Obama greets Israeli children prior to meeting with Israeli President Shimon Peres at the President's Residence in Jerusalem, March 20, 2013, on the first day of Obama's three day trip to Israel.
- [SAUL LOEB/AFP/Getty Images]

In this handout image supplied by the Government Press Office of Israel (GPO), U.S. President Barack Obama (L) takes part in a tree planting ceremony with Israeli President Shimon Peres at his residence on March 20, 2013 in Jerusalem, Israel. This is Obama's first visit as president to the region, and his itinerary will include meetings with the Palestinian and Israeli leaders as well as a visit to the Church of the Nativity in Bethlehem.
- [GPO/AFP/Getty Images]

US President Barack Obama and Israeli President Shimon Peres poses for photos with children after they sang prior to meetings at the President's Residence in Jerusalem, March 20, 2013, on the first day of Obama's three day trip to Israel.
- [SAUL LOEB/AFP/Getty Images]

US President Barack Obama (L) and Palestinian President Mahmoud Abbas (R) shake hands during an official arrival ceremony at the Muqata, the Palestinian Authority headquarters in the West Bank city of Ramallah, on March 21, 2013. Obama arrived in the West Bank city of Ramallah on his first visit since taking over the White House more than four years ago.
- [SAUL LOEB/AFP/Getty Images]