Rishi Sunak's authority has been dealt a fresh challenge by a Tory former minister insisting the Conservatives face an electoral "massacre" under his leadership.Sir Simon Clarke, who served in the Treasury while Mr Sunak was chancellor, said "extinction is a very real possibility" with the Prime Minister at the helm.Writing in the Telegraph, he said: "Rishi Sunak has gone from asset to anchor."

Rishi Sunak's authority has been dealt a fresh challenge by a Tory former minister insisting the Conservatives face an electoral "massacre" under his leadership.Sir Simon Clarke, who served in the Treasury while Mr Sunak was chancellor, said "extinction is a very real possibility" with the Prime Minister at the helm.Writing in the Telegraph, he said: "Rishi Sunak has gone from asset to anchor."