Dewan Rakyat speaker Azhar Azizan Harun has been urged to explain why the vote of confidence on the prime minister and election of his replacement was not on the Dewan Rakyat agenda.

DAP secretary-general Lim Guan Eng said Azhar and the Attorney-General Idrus Harun, who happens to be Azhar's elder brother, were both present at Istana Negara on Aug 17 when the Yang di-Pertuan Agong decreed during an audience with heads of political parties that the vote of confidence must be held.