Sir Keir Starmer has accused the Prime Minister of lying about Labour's tax plans during a heated debate.
Rishi Sunak claimed a Labour government would mean £2,000 worth of tax rises per working household.
But Sir Keir insisted his party would not introduce any tax rises for working households, something reiterated by Chancellor Rachel Reeves on Wednesday.
Speaking to the media on Wednesday for the first time since the debate, Mr Starmer said: "[Tuesday] night really mattered because what you saw was a Prime Minister with his back against the wall, desperately lashing out and resorting to lies - and he knew he was lying. And I don’t say that lightly.”
He added: "The character of the prime minister was exposed."
The Tories say the figure arose based on how much they thought Labour's spending promises would cost, dividing it by the number of UK households with at least one working person.
The Conservatives claim the plans amount to £38.5bn, though this figure is disputed.
The UK’s official statistics regulator says it is looking into the Conservatives' claim.