The Security Council’s responsibility regarding admission of new members to the United Nations is laid out in Article 4 of the Charter of the United Nations, paragraph 2 of which states that the admission of States to the United Nations will be effected by a decision of the General Assembly following the recommendation of the Security Council. Rules 58-60 of the Council’s Provisional Rules of Procedure further deal with the admission of new members. Articles 5 and 6 of the Charter of the United Nations deal respectively with suspension of rights and privileges of membership, and with expulsion from the United Nations.
The Repertoire includes a section which lays out the exact history and process for admission followed for each new member that joined after 1946, the role of the Committee on the Admission of New Members, discussions relating to membership and other related material. For the role of the General Assembly in admission of new members, see Relations with the General Assembly, membership in the UN, under Relations with the Other United Nations Organs.
The Repertoire also features Security Council deliberations on and references to the question of membership, including potential application of Articles 5 and 6 to suspend or expel the United Nations members.