Salleh Said Keruak
Lim Kit Siang has challenged Prime Minister Najib Tun Razak to a debate. Maybe Kit Siang has forgotten he is just the Chairman of DAP. He is not even the leader of Pakatan Harapan so that does not put him at the same level as the Prime Minister, who is the Chairman of Barisan Nasional.
If Kit Siang is Pakatan Harapan's leader or the Shadow Prime Minister then this gives him some leverage to demand that Najib debate him.
Kit Siang must first take over as Pakatan Harapan's leader from Dr Wan Azizah Ismail and officially announce he is Pakatan's Shadow Prime Minister before challenging Najib to a debate.