Israeli Prime Minister Benjamin Netanyahu, shown speaking in Washington in March, announced a new coalition government on Wednesday night. The deal assures Netanyahu of a fourth term, but he has a narrow majority in parliament with a coalition that could be vulnerable to collapse. Pablo Martinez Monsivais/AP hide caption

itoggle caption Pablo Martinez Monsivais/AP

President Obama with Israeli Prime Minister Benjamin Netanyahu at the White House in 2013. The two have never had a warm and fuzzy relationship. Charles Dharapak/AP hide caption

itoggle caption Charles Dharapak/AP

Israeli Prime Minister Benjamin Netanyahu speaks to supporters Tuesday at his election campaign headquarters in Tel Aviv. If he succeeds in forming a coalition government, he would begin a historic fourth term. Lior Mizrahi/Getty Images hide caption

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An Israeli woman votes with her daughter at a polling station in the coastal city of Haifa on Tuesday. Israel faces an unpredictable election to determine whether Prime Minister Benjamin Netanyahu will remain in power. Ahmad Gharabli /AFP/Getty Images hide caption

itoggle caption Ahmad Gharabli /AFP/Getty Images

Israeli Prime Minister Benjamin Netanyahu speaks before a joint meeting of Congress on Capitol Hill in Washington on Tuesday. Netanyahu said the world must unite to "stop Iran's march of conquest, subjugation and terror." House Speaker John Boehner of Ohio (left) and Sen. Orrin Hatch, R-Utah, listen. Andrew Harnik/AP hide caption

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President Obama said Tuesday that there was "nothing new" in Israeli Prime Minister Benjamin Netanyahu's speech to Congress about Iran's nuclear program. Jacquelyn Martin/AP hide caption

itoggle caption Jacquelyn Martin/AP

Israeli Prime Minister Benjamin Netanyahu speaks before a joint meeting of Congress on Capitol Hill in Washington on Tuesday. He called the deal the U.S. and its allies are negotiating with Iran "very bad." Susan Walsh/AP hide caption

itoggle caption Susan Walsh/AP