Rishi Sunak steps up attack on Truss tax cuts as poll puts his rival well ahead

Former chancellor says opponent's economic policies risk stoking inflation and pushing up interest rates

Rishi Sunak has launched his strongest attack yet on his rival Liz Truss's economic policies, claiming her 30bn plans for unfunded tax cuts risk stoking inflation and pushing up interest rates.

His attack came as a new poll of Tory party members gave Truss a commanding lead in the race to become prime minister.