Yossi Klein Halevi on the new turmoil in his city:

Why, then, the outbreak of violence now? Why Hamas's "day of rage" over Jerusalem and the Palestinian Authority's call to gather on the Temple Mount to "save" the Dome of the Rock from non-existent plans to build the Third Temple? Why the sudden outrage over rebuilding a synagogue, destroyed by the Jordanians in 1948, in the Old City's Jewish Quarter, when dozens of synagogues and yeshivas have been built in the quarter without incident?

The answer lies not in Jerusalem but in Washington. By placing the issue of building in Jewish neighborhoods in East Jerusalem at the center of the peace process, President Obama has inadvertently challenged the Palestinians to do no less.

Astonishingly, Obama is repeating the key tactical mistake of his failed efforts to restart Middle East peace talks over the last year. Though Obama's insistence on a settlement freeze to help restart negotiations was legitimate, he went a step too far by including building in East Jerusalem. Every Israeli government over the last four decades has built in the Jewish neighborhoods of East Jerusalem; no government, let alone one headed by the Likud, could possibly agree to a freeze there. Obama made resumption of negotiations hostage to a demand that could not be met. The result was that Palestinian leaders were forced to adjust their demands accordingly.

Obama is directly responsible for one of the most absurd turns in the history of Middle East negotiations. Though Palestinian leaders negotiated with Israeli governments that built extensively in the West Bank, they now refused to sit down with the first Israeli government to actually agree to a suspension of building. Obama's demand for a building freeze in Jerusalem led to a freeze in negotiations.