Why is Sadiq Khan giving Americans his views on the US election?

‘It’s important for those of us who are foreigners to stay out of the US elections.’ So said the mayor of London, Sadiq Khan, with due propriety during his visit to America last week. Unfortunately he then added: ‘I hope that the best candidate wins and I hope she does win with a stomping majority.’

Given the febrile state of US politics, I’m sure that this cringe-worthy endorsement is precisely the sort of intervention that Clinton needs in order to get her faltering campaign back on track. And perhaps the lord mayor of, say, Wandsworth could polish his chain of office and head to Paris to advise the French on how to cast their votes in next year’s presidential campaign? It would do about as much good and a lot less harm.