Section 278(1) of the Constitution of Zimbabwe incorporates section 129(1)(k) and applies it to mayors, chairpersons and councillors of local authorities, such that they lose their seats when they cease to be members of the political party that sponsored their election, upon written notice by the party to the Minister responsible for local government. Section 278 provides two distinct grounds for vacation of office: (1) cessation of party membership under section 278(1) read with section 129(1)(k); and (2) removal by an independent tribunal on specified grounds under section 278(2). Courts cannot interdict the lawful exercise of statutory powers by electoral commissions where such bodies are performing peremptory administrative functions without any discretion or review powers, as this would violate the separation of powers doctrine.