The BBC has been unable to verify that figure, but when the Guardian asked repeatedly about the penalty, Mr Zahawi's spokesperson did not deny one had been paid.Speaking to BBC Radio 4's Today programme, Deputy Prime Minister Mr Raab said Mr Zahawi "has been transparent about the fact that all of the tax has been paid and he doesn't have any tax outstanding".Labour's deputy leader Angela Rayner told BBC Breakfast: "The position of the man who was until recently in charge of the UK's tax system, and who this prime minister appointed Conservative Party Chair, is now untenable.Shadow Chancellor Rachel Reeves echoed Ms Rayners calls for Mr Zahawi to go, saying: "If the prime minister wants to stick by his commitment for integrity, honesty and professionalism, he should do the right thing and sack Nadhim Zahawi."Questions about Mr Zahawi's tax affairs have added to a series of challenges this week for the prime minister, who was fined by police for not wearing a seatbelt in the back of a moving car."