NEW : Hamas warns Abbas not to go to the United Nations . Israeli Prime Minister Benjamin Netanyahu is expected to speak at the U.N. Security Council . Israel is calling on Palestinian leaders to return to peace talks , a spokesman says . Comment:
NEW : Hamas warns Abbas not to go to the United Nations . Israeli Prime Minister Benjamin Netanyahu is expected to speak at the U.N. Security Council . Israel is calling on Palestinian leaders to return to peace talks , a spokesman says . Palestinian President Mahmoud Abbas presses for full U.N. membership .