Malaysian politics: as Najib and fellow graft suspects gain strength, what’s next for PM Ismail Sabri?

• The Barisan Nasional coalition is on a high after a sweeping victory in Johor, prompting calls from its Umno stalwarts for an early general election
• Observers suspect former PM Najib is plotting a return to power to exonerate himself from the 1MDB scandal. If so, Ismail Sabri’s future may rest with the opposition