(b) The member has participated in the making of any decision on the case covered by the communication in any capacity other than under the procedures applicable to this Optional Protocol; (c) The member is a national of the State party concerned. 2. Any question that may arise under paragraph 1 above shall be decided by the Committee without the participation of the member concerned. Withdrawal of a member Rule 61 If, for any reason, a member considers that she or he should not take part or continue to take part in the examination of a communication, the member shall inform the Chairperson of her or his withdrawal. Establishment of working groups and designation of rapporteurs Rule 62 1. The Committee may establish one or more working groups, each comprising no more than five of its members, and may designate one or more rapporteurs to make recommendations to the Committee and to assist it in any manner in which the Committee may decide. 2. In the present part of the rules, reference to a working group or rapporteur is a reference to a working group or rapporteur established under the present rules. 3. The rules of procedure of the Committee shall apply as far as possible to the meetings of its working groups. Interim measures Rule 63 1. At any time after the receipt of a communication and before a determination on the merits has been reached, the Committee may transmit to the State party concerned, for its urgent consideration, a request that it take such interim measures as the Committee considers necessary to avoid irreparable damage to the victim or victims of the alleged violation. 2. A working group may also request the State party concerned to take such interim measures as the working group considers necessary to avoid irreparable damage to the victim or victims of the alleged violation. 3. When a request for interim measures is made by a working group or rapporteur under the present rule, the working group shall forthwith thereafter inform the Committee members of the nature of the request and the communication to which the request relates. 4. Where the Committee or a working group requests interim measures under this rule, the request shall state that it does not imply a determination of the merits of the communication. 115