By Humeyra Pamuk JERUSALEM (Reuters) – Washington’s top diplomat will try to deepen Israeli-Arab rapprochement at a summit in Israel on Sunday where he may also face pushback against the emerging Iran nuclear deal and questions about the U.S.-Russia struggle over Ukraine. Kicking off a regional tour, U.S. Secretary of State Antony Blinken will meet Israeli Prime Minister Naftali Bennett before joining Foreign Minister Yair Lapid and counterparts from four Arab countries at a desert retreat. Topping the agenda are the Iran nuclear talks, about which Israel and Gulf Arab states have voiced stron…

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