Act Governing Relations between the People of the Taiwan Area and the Mainland Area Article 33-2

Any authorities, institutions or legislative organs at any local government level of the Taiwan Area shall not form any coalition with any local authorities of the Mainland Area unless the Ministry of Interior in consultation with the Mainland Affairs Council, Executive Yuan reports to the Executive Yuan for consent.Those who had already engaged in any activity referred to in the preceding paragraph before the coming into force of the amendments to this Act and continued it thereafter shall report to the Executive Yuan for consent within three months after the date of the coming into force of the amendments to this Act. It shall be deemed without consent if by the expiration of the aforementioned time limit, no report for consent is made or the Executive Yuan does not give consent.
中文原文 臺灣地區與大陸地區人民關係條例第33-2條
臺灣地區各級地方政府機關(構)或各級地方立法機關,非經內政部會商行政院大陸委員會報請行政院同意,不得與大陸地區地方機關締結聯盟。
本條例修正施行前,已從事前項之行為,且於本條例修正施行後仍持續進行者,應自本條例修正施行之日起三個月內報請行政院同意;屆期未報請同意或行政院不同意者,以未報請同意論。

English translation for reference only; the Chinese text prevails. Not legal advice.