New York mayoral candidate Zohran Mamdani speaks at Dutch Kills Playground on Monday.Sadiq Khan has reignited his long-running feud with Donald Trump by backing left-wing Democrat Zohran Mamdani to win the race to become mayor of New York.Mamdani has come under fierce attacks from the US president, who has labelled him a “communist” and amplified false claims that he is in the US illegally.Trump has also threatened to withhold US government funds from New York if Mamdani wins the election, which  taking place today.The US president has been an outspoken critic of Khan too, recently telling the United Nations General Assembly that he is a “terrible terrible mayor” and accusing him of wanting to introduce Sharia Law to London.A source close to the London mayor said there were “similarities between the attacks Mamdani has faced and what Sadiq has faced in elections”.“Weaponising Mamdani’s faith and linking him to terrorism and extremism is an old campaigning tactic, and one we’re all too familiar with here in London,” t