London Mayor Sir Sadiq Khan said he was baffled by Donald Trump's latest attack after the 80-year-old President branded him a 'bad person' and 'horrible representative'. The two have a long-running feud

Upon Mr Trump's election to the White House , Mr Khan claims death threats against him soared by 2,000 per cent.

Speaking to reporters in the White House, Mr Trump blasted Mr Khan as he criticised what he saw as the UK's failure to tackle issues with immigration and crime.