RISHI SUNAK has ordered an investigation into Nadhim Zahawi’s tax affairs as the minister faces mounting calls to resign.

The Tory chairman continued to dig his heels in today with an ally saying he was “absolutely not resigning” after admitting to settling a multi-million pound tax bill with HMRC last summer when he was chancellor. 

The PM has asked his new ethics adviser Sir Laurie Magnus to assess whether the former chancellor breached the ministerial code over the settlement.