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Donald Trump was left isolated at the end of a fractious G20 summit in Hamburg, Germany, after every other world leader signed up to a declaration that the Paris climate agreement was irreversible following an unprecedented standoff.
Thomas Bernes, now a fellow at the Centre for International Governance Innovation, said: “I was involved in the Canada-US trade agreement and it was extremely complicated. No one will be interested in a trade deal until you know where the UK is vis-a-vis the European Union and until that point is reached you can have plenty of goodwill but it is nothing more than that.”