Pakatan Harapan chairperson Dr Mahathir Mohamad has attributed BN's Cameron Highlands by-election victory to the cooperation between former rivals PAS and Umno.

Speaking to reporters after chairing the Harapan presidential council meeting in Putrajaya today, Mahathir took a jab at both parties by recalling how PAS president Abdul Hadi Awang had referred to Umno as "parti kafir" (infidel party) in the 1980s.