But Daniel Levy, a former Israeli peace negotiator who is now the head of the Middle East and North Africa program at the European Council on Foreign Relations, warned that the administration’s patience was growing thin. “What the Obama administration is saying is that, ‘Yes, we’re still committed to you,’ ” Mr. Levy said. “But if you don’t give us something to work with, we can’t continue to carry the rest of the world for you.”Mr. Netanyahu’s objections to a nuclear deal with Iran, and his decision to firmly ally himself with Mr. Obama’s Republican opponents in expressing his ire over the Iran talks, may well have hardened the president’s decision to push for an agreement, one Obama adviser said Wednesday. At the very least, Mr. Netanyahu’s opposition has done nothing to steer Mr. Obama away from his preferred course of reining in Iran’s nuclear ambitions through an international agreement that would sharply limit Tehran’s ability to produce nuclear fuel for at least 10 years, in exchange for a gradual easing of economic sanctions. Mr. Kerry and Mohammad Javad Zarif, the Iranian foreign minister, are continuing talks in Lausanne, Switzerland, this week with the goal of reaching an agreement by the end of the month.