The U.N. General Assembly decided Wednesday to continue negotiations on Security Council reform at the next session, eyeing a possibly enlarged body with a membership "in the mid-20s."

Debate has raged for decades over how to restructure the council, which currently comprises five permanent veto-wielding members — Britain, China, France, Russia and the United States — and 10 elected members that serve two-year terms.

The assembly's unanimous decision says member states should continue reform negotiations in the next session beginning in mid-September.