The move to investigate the foreign exchange (forex) losses has led Muhyiddin Yassin to question the reason for Prime Minister Najib Abdul Razak's silence on the matter for more than two decades.

The Parti Pribumi Bersatu Malaysia (Bersatu) president said if Najib was seeking the truth with regard to this scandal, he should have voiced his concern when he was a member of Dr Mahathir Mohamad's cabinet.