Sayeeda Warsi has joined forces with Doreen Lawrence and Shami Chakrabarti to launch an attack on Nigel Farage, accusing him of spreading fear with the "age-old racist" claim that migrants could put women in Britain at risk of sexual assaults.

A letter to the Guardian signed by Lady Warsi and the high-profile human rights campaigners Lady Lawrence and Chakrabarti, demands an apology from Farage when he takes part with the prime minister in a live EU referendum programme on ITV on Tuesday night.

Warsi, a Tory peer and former party chairman, shares the Ukip leader's desire for Britain to leave the EU, but has hit out at his latest comments over the weekend, writing to claim that he has plumbed to new depths and crossed the "line of civilised discourse".

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