The United Nations Security Council is scheduled to vote Friday on a Palestinian request for full U.N. membership, said diplomats, a move that Israel ally the United States is expected to block because it would effectively recognize a Palestinian state.

The 15-member council is due to vote at 3 p.m. Friday on a draft resolution that recommends to the 193-member U.N. General Assembly that "the State of Palestine be admitted to membership of the United Nations," diplomats said.

A council resolution needs at least nine votes in favor and no vetoes by the U.S., Britain, France, Russia or China to pass. Diplomats say the measure could have the support of up to 13 council members, which would force the U.S. to use its veto.