London Mayor Sadiq Khan said on Tuesday Donald Trump was a poster boy for far-right activists all over the world, continuing a long-running spat with the US President.
"Surely we should be saying 'listen, you know, you do realise you're a poster-boy for the far-right movement around the world," he told Sky News in an interview, citing Trump's policies on Muslims and immigration centres, reports Reuters.
Trump lashed out at London Mayor Sadiq Khan on Monday, calling him a "stone-cold loser" after the mayor criticised the British government for inviting the US president for a state visit.
On Monday, Trump arrived in Britain with his wife Melania for a three day visit, and he had already blasted Khan before his plane touched down.
"He is a stone cold loser who should focus on crime in London, not me."
On Sunday, Labour's Khan said it was important to have good relations with the United States but that Britain should not be "rolling out the red carpet" for Trump. He has also compared Trump to 20th century fascists.
"This is much more serious than childish insults which should be beneath the President of the United States," a spokesman for the mayor said.
"Sadiq is representing the progressive values of London and our country warning that Donald Trump is the most egregious example of a growing far-right threat around the globe."