DAP veteran Lim Kit Siang taking up the position of deputy prime minister should BN lose grip of Putrajaya was a certainty, according Prime Minister Najib Abdul Razak.

In his speech at Sindumin, Sabah yesterday, Najib said this had already been agreed on between Lim and Dr Mahathir Mohamad, the chairperson of Parti Pribumi Bersatu, although no decision was made on who should be prime minister.

Najib said that this "ali baba" arrangement, if successful, would make Lim incredibly powerful as he would be able to choose who would be prime minister.