Palestinian President Mahmoud Abbas (R) shakes hands with U.S. President Barack Obama upon his arrival in the West Bank city of Ramallah on March 21, 2013. Obama arrived in Tel Aviv in Israel Wednesday to start his Mideast tour. Obama will spend three days in Israel, the Palestinian territories and Jordan. (Xinhua/POOL)

Palestinian President Mahmoud Abbas (R) and U.S. President Barack Obama attend a joint press conference in the West Bank city of Ramallah on March 21, 2013. Obama arrived in Tel Aviv in Israel Wednesday to start his Mideast tour. Obama will spend three days in Israel, the Palestinian territories and Jordan. (Xinhua/POOL)

Palestinian President Mahmoud Abbas welcomes U.S. President Barack Obama upon his arrival in the West Bank city of Ramallah on March 21, 2013. Obama arrived in Tel Aviv in Israel Wednesday to start his Mideast tour. Obama will spend three days in Israel, the Palestinian territories and Jordan. (Xinhua/POOL)

Palestinian President Mahmoud Abbas (R) welcomes U.S. President Barack Obama upon his arrival in the West Bank city of Ramallah on March 21, 2013. Obama arrived in Tel Aviv in Israel Wednesday to start his Mideast tour. Obama will spend three days in Israel, the Palestinian territories and Jordan. (Xinhua/POOL)

U.S. President Barack Obama receives flowers from a Palestinian child during a welcoming ceremony upon his arrival in the West Bank city of Ramallah on March 21, 2013. Obama arrived in Tel Aviv in Israel Wednesday to start his Mideast tour. Obama will spend three days in Israel, the Palestinian territories and Jordan. (Xinhua/POOL)

U.S. President Barack Obama shakes hands with a Palestinian child during his visit to Al Bera youth center in the West Bank city of Ramallah on March 21, 2013. Obama arrived in Tel Aviv in Israel Wednesday to start his Mideast tour. Obama will spend three days in Israel, the Palestinian territories and Jordan. (Xinhua/POOL)

U.S. President Barack Obama shakes hands with a Palestinian child during his visit to Al Bera youth center in the West Bank city of Ramallah on March 21, 2013. Obama arrived in Tel Aviv in Israel Wednesday to start his Mideast tour. Obama will spend three days in Israel, the Palestinian territories and Jordan. (Xinhua/POOL)

U.S. President Barack Obama (C) waves his hand during a visit to Al Bera youth center in the West Bank city of Ramallah on March 21, 2013. Obama arrived in Tel Aviv in Israel Wednesday to start his first visit as U.S. president to Israel. Obama will spend three days in Israel, the Palestinian territories and Jordan. (Xinhua/POOL)

U.S. President Barack Obama is seen during a visit to Al Bera youth center in the West Bank city of Ramallah on March 21, 2013. Obama arrived in Tel Aviv in Israel Wednesday to start his first visit as U.S. president to Israel. Obama will spend three days in Israel, the Palestinian territories and Jordan. (Xinhua/POOL)

U.S. President Barack Obama (front) looks on during his visit to Al Bera youth center in the West Bank city of Ramallah on March 21, 2013. Obama arrived in Tel Aviv in Israel Wednesday to start his first visit as U.S. president to Israel. Obama will spend three days in Israel, the Palestinian territories and Jordan. (Xinhua/POOL)