Pakatan Harapan has expressed regret over the alleged letter informing Dr Mahathir Mohamad that his invitation to the installation of the next Yang di-Pertuan Agong has been withdrawn.

The coalition's secretariat chief Saifuddin Abdullah requested the Conference of Rulers to reconsider its decision.

"All three Pakatan Harapan parties had signed an agreement which among others pledged our commitment to uphold the royal institution.

"So we regret this incident and we feel it should not have happened," he told a press conference after a Pakatan Harapan secretariat meeting at the DAP headquarters in Kuala Lumpur