WASHINGTON — President Barack Obama was said to have pledged to Saudi Arabia that the United States would force Israel to withdraw from eastern Jerusalem and the entire West Bank by 2012. Diplomatic sources said Obama relayed a pledge to Saudi King Abdullah that he would take any measure to ensure an Israeli withdrawal from the West Bank and Jerusalem over the next 18 months. They said Obama relayed the pledge to Abdullah during the president’s trip to Riyad in June 2009, about four months after he assumed office, in exchange for Abdullah’s help to arrange for the end of...