Rachel Reeves and Keir Starmer at the Labour conference in October.

Keir Starmer will back Rachel Reeves’ Budget as pressure mounts on the chancellor over claims she misled the country over the state of the public finances.

The prime minister will deliver a speech on Monday insisting last week’s Budget set the UK on the right economic course and announcing a fresh Labour bid to reform the country’s welfare system.

It comes after Reeves was forced to deny lying to voters as she laid the ground for the £26 billion of tax rises she announced last Wednesday.

Treasury officials suggested there was a black hole of up to £30bn in the government’s books as the chancellor pondered – and then eventually ditched –........

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