Khan correct to criticise Trump

SIR, – Malcolm Parkin’s comments (Letters, July 16) about London Mayor Sadiq Khan being unable to grasp the concept of being polite to a visiting head of state is a joke.

The head of state in question vilified both Mr Khan and Mrs May breaking every rule of etiquette surrounding a guest’s behaviour to his hosts.

I was impressed by Mr Khan’s measured response to Mr Trump’s attack on him which was, quite frankly, appalling.