The London Mayor issued a warning to the US President after it was announced he will officially visit the UK for the first time in July. The trip will take place on Friday the 13th - after Mr Trump stops off in Brussels for a summit of Nato leaders. But Mr Khan - who has clashed repeatedly with him on several occasions - issued a thinly vieled warning that he will face angry protesters if he comes to London. The Mayor tweeted: "If he comes to London, President Trump will experience an open and diverse city that has always chosen...