Israel-US relations battered by split over Iran For much of the past week, Benjamin Netanyahu has taken every opportunity to slam a proposed nuclear agreement with Iran, but the Israeli prime minister's most barnstorming performance was a Sunday speech to the Jewish Federations of North America. "It is a bad and dangerous deal that affects our survival," he told the group, who held their annual convention in Jerusalem. Iranian designs for a nuclear bomb that could reach the US were "the plan coming to a theatre near you." "Is that what you want?" he asked the audience, who responded "No." Well do something about it. We are. No nuclear deal has yet been signed by Iran and the six world powers involved in the talks, but the negotiations have opened up a crisis between Israel and the US. The public and aggressive lobbying of Washington by Mr Netanyahu, who has had a turbulent relationship with Barack Obama since he became prime minister in 2009, is a gamble for Israel. The Israeli leader, whose positions on Iran enjoy strong support in the US Congress, could end up playing a "bad cop" role that helps the Obama administration secure a better deal with Iran. At the same time, Mr Netanyahu risks damaging Israel's close relations with the US if he is blamed for the failure of the diplomatic process with Iran, which could be a big step towards a military confrontation. With one eye on Congressional demands for more sanctions and the other on Israel, the White House warned on Tuesday against a "march to war" with Iran. Public quarrelling between the US and Israel was "not good for the Jews," Eitan Haber wrote in Israel's Yedioth Ahronoth on Tuesday. Former state department official Tamara Cofman Wittes warned: "The worst thing that Israelis could do for their long-term alliance with Washington is to be seen by the American public dragging the US into a war their government sought to avoid." Obama administration officials acknowledge that pressure from Mr Netanyahu has been indispensable in establishing the sanctions regime that has pushed Iran to the negotiating table, but some in Washington fear the Israeli leader does not want a nuclear agreement. The public disagreements continued on Wednesday when the US State department disputed Israeli comments about the relief from sanctions that Iran might receive under the proposed deal. Yuval Steinitz, Israel's strategic planning minister, said that deal could reduce the cost of sanctions to Iran by up to $40bn a year. However, Jen Psaki, a State department spokeswoman, said the comments were "inaccurate and exaggerated." Colin Kahl, a former senior Pentagon official for the Middle East, said demands Mr Netanyahu had set out for a deal with Iran - including no uranium enrichment to any level - were not realistic. "There is not a single Iran analyst on planet Earth who believes the Iranian regime would accept that," said Mr Kahl. They would see it as capitulation and surrender. Mr Obama's first term was rocked by tense encounters with Mr Netanyahu, including a history lecture from the Israeli leader in 2011 in front of the cameras in the Oval office. The US president tried to put that friction aside with a March visit to Israel, when he both tried to improve relations with Mr Netanyahu and wooed Israeli public opinion. However, in the past week many of those frictions have returned, including public sniping about the terms of a possible agreement with Iran. Speaking in Dubai on Monday, John Kerry, US secretary of state, warned Israel that "the time to oppose is when you see what it is." Gilad Erdan, environment minister and a member of Mr Netanyahu's Likud party, responded: "Kerry's argument is strange: Does he expect the prime minister to wait until mistakes are made, once it is too late to fix the agreement?" Aaron David Miller, a former state department official who has described dealings between the two leaders as "the most dysfunctional in the history of US-Israeli relations," said "it appears this dysfunctional relationship is now being repeated with Kerry and Netanyahu." For some in Israel, Washington's apparent eagerness to pursue talks with Iran has revived fears about whether Mr Obama would ever contemplate military action against Iranian nuclear sites - anxieties that were aggravated by his wavering over striking Syria. "Not only Israel, but countries like Saudi Arabia and other Gulf states feel the US is dropping its allies in the region and leaving them to deal with the problems of Iran," said Oded Eran, senior researcher with the Institute for National Security Studies and a former Israeli deputy ambassador in Washington. In the process, tensions over Iran have become linked to the US push behind the Israeli-Palestinian peace process. After the White House said on Tuesday it was "deeply concerned" about plans to build 24,000 homes in the occupied West Bank and East Jerusalem, Mr Netanyahu called for the plans to be frozen. It "creates an unnecessary confrontation with the international community at a time when we are making an effort to persuade elements in the international community to reach a better deal with Iran," he said. As he picks a public fight with Washington over the nuclear talks, Mr Netanyahu cannot afford a separate dispute over the peace process.