Trump had also told Politico Sir Sadiq had been elected “because so many people have come in”.
In response to Trump’s remarks, Sir Sadiq told Politico, external on Tuesday that the president was “obsessed” with him and said “record numbers of Americans” were moving to London because the city’s liberal values were the “antithesis” of Trump’s.
“I think it is for President Trump to explain what he means by that,” he said, adding that he had “no idea” why Trump was “so obsessed” with London’s leadership.
Sir Keir was urged to tell the American leader not to meddle in European politics during Prime Minister’s Questions.
Liberal Democrat leader Sir Ed Davey said the prime minister should tell Trump that “any attempts to interfere with our democracy are totally unacceptable”, in relation to America’s new security strategy.