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In a humiliating revelation ahead of the polls today, it emerged that Mr Khan had described Muslim moderates as “Uncle Toms” when he was minister for community cohesion in Labour’s last government in 2009.

The highly charged phrase has been used in black groups to refer to those who failed to take on white prejudice.

During a discussion about Muslim voters, Mr Khan said: "You can't just pick and choose who you speak to. You can't just talk to Uncle Toms."

Mr Khan's team said he "regrets" using the phrase, used against black people to suggest they are subservient to whites.