PAS has banned the debate between its election director Mustafa Ali and Salor state assemblyperson Husam Musa over the latter's claim that there had been talks of a merger between PAS and Umno in 2008. br br PAS secretary-general Takiyuddin Hassan said at a press conference at Parliament lobby today that there is a gag order imposed on all leaders, including Husam, Mustafa, and the organiser.