US President Donald Trump has accused his French counterpart Emmanuel Macron of being “nasty” for saying Nato was brain dead. Mr Trump is in London for a summit marking the bloc’s 70th anniversary. At a news conference, Mr Trump said Nato served a great purpose and Mr Macron’s remarks had been “very insulting”. He also said he could see France “breaking off” from Nato, but did not explain why. Speaking last month, Mr Macron had complained that Nato members were no longer co-operating on key issues.