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 has been moribund.

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