An ill-timed municipal housing announcement in Jerusalem has mutated into one of the most serious conflicts between the United States and Israel in two decades, leaving a politically embarrassed Israeli government scrambling to respond to a tough list of demands by the Obama administration. The Obama administration has put Prime Minister Benjamin Netanyahu in a difficult political spot at home by insisting that the Israeli government halt a plan to build housing units in East Jerusalem. The administration also wants Mr. Netanyahu to commit to substantive negotiations with the Palestinians, after more than a year in which the peace process...