JERUSALEM, ISRAEL – NOVEMBER 20: Israel’s Prime Minister Benjamin Netanyahu (R) and U.S. Secretary of State Hillary Clinton leave after delivering joint statements November 20, 2012 in Jerusalem, Israel. The United States signaled today that a Gaza truce could take days to achieve after Hamas, the Palestinian enclave’s ruling Islamist militants, backed away from an assurance that it and Israel would stop exchanging fire within hours. (Photo by Baz Ratner-Pool/Getty Images)