Mr Trump escalated his feud with the London mayor when he described him as “among the worst mayors in the world” earlier this week.

The US president claimed Sir Sadiq had wanted to be part of the state visit but Mr Trump said he “asked that he not be there”.

Asked to respond to Mr Trump’s claim, the mayor of London told the PA news agency on Sunday: “I’ve not really given it much thought.

“I am indifferent to President Trump.

“I literally (have) more important things to worry about.”

There has been a long-running war of words between Mr Trump and the Labour mayor, who accused the American leader of encouraging divisive far-right politics around the world as he landed in Britain on Tuesday.

Speaking to reporters on Air Force One on Thursday after his state visit, Mr Trump said: “I did

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