If the Council seek to exclude the press or public, this must be done through a resolution, and the resolution should be stipulated as an agenda item. However, it need not necessarily arise through a member motion. The clerk may identify that confidential or exempt information may be divulged at the meeting & can inform the members about this and call for a resolution accordingly to exclude. Some resolved exclusions could apply to several meetings, some of which may be in the future, perhaps an ongoing legal matter etc which comes up for discussion on a regular basis for a while.