At best, Barack Obama committed the latest big mistake in his conduct of foreign policy last week. At worst, the president carried out a deliberate operation intended to weaken the U.S.-Israel relationship and turn the public against the Jewish State. An announcement was made by a ministry of the Israeli government during Vice President Joe Biden's visit to Israel that building permits were to be issued for a neighborhood in Jerusalem. The area concerned was expressly excluded from the moratorium on building that Prime Minster Netanyahu had offered to encourage the Palestinians to come to peace talks. The area is...