Malaysian Prime Minister Najib Razak called for patience on investigations into the state investment company, warning infighting in the ruling party would risk sowing voter discord.

The statement came after Deputy Premier Muhyiddin Yassin stepped up his calls for answers over the 1Malaysia Development Bhd. imbroglio. Najib must explain 1MDB's debt and why the government invested in money-losing ventures, giving people "the real truth," he told members of their United Malays National Organisation party on Sunday.

"Malaysians are not stupid," Muhyiddin said, according to comments carried by local media and verified by his office. "They are well-informed. Don't underestimate them. We cannot lie."