* Palestinians want U.N. deadline for Israeli withdrawal * Unilateral bid follows collapse of peace talks * Israel seeks U.S. veto in Security Council (Adds comment from Jordan and Palestinian U.N. envoys and U.N. Middle East peace envoy) By Lesley Wroughton ROME, Dec 15 (Reuters) - Israeli Prime Minister Benjamin Netanyahu said before talks on Monday with U.S. Secretary of State John Kerry that he would defy any United Nations move to "dictate" a time frame for withdrawal from land Palestinians seek for a state. The pair met in Rome for nearly three hours. ...