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Sir Sadiq Khan has criticised Donald Trump in a set-piece opening speech at a Brazil climate change conference - the London mayor’s fifth foreign trip of the year.

He told the “biggest-ever gathering of mayors” that the US president was one of the climate “wreckers” they needed to fight back against to reduce the threat of global warming.

In remarks that were not released in advance, Sir Sadiq essentially reactivated his long-running war of words with President Trump.

Speaking in the “magical city” of Rio on Monday morning, he said: “Famous among the wreckers is th

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