Prime Minister Tun Dr Mahathir Mohamad wants Datuk Seri Najib Razak to back up his claim that "one of Mahathir's people" had collected RM10mil in cash from the former premier for the 13th General Election. When approached by a reporter from Malaysiakini, he said, "Show evidence, ask him to show evidence," after speaking at the American Chamber of Commerce Malaysia's AGM luncheon in Kuala Lumpur on Thursday.