Dr Mahathir Mohamad said he would not step down as Pakatan Harapan chairperson even if the Royal Commission of Inquiry (RCI) into Bank Negra's foreign exchange losses implicated him.

"I won't accept it because it has nothing to do with my politics," he told reporters after attending the RCI hearing in Putrajaya as an observer today.

By some accounts, Bank Negara loss up to RM30 billion as a result of speculation on the foreign exchange market in the late 1980s and early 1990s. Mahathir was prime minister at the time.