RAMALLAH, West Bank — Palestinians will ask the U.N. Security Council to support their bid for statehood, a senior official said Sunday — a move that would set the stage for a showdown with the U.S. Legislator Hanan Ashrawi is the first Palestinian official to spell out that the Palestinians plan to ask the Security Council to endorse admitting Palestine as a full-fledged state, despite an expected U.S.