Ahead of the US President’s three-day State visit to the UK, starting tomorrow, Khan also condemned the decision to roll-out the red carpet for the UK’s closest ally.
It is the latest instalment in a long-running feud between the multimillionaire and Tooting-born Labour Mayor that dates back to 2016.
Trump failed to mention the London mayor in an interview with The Sun last week, ahead of his State visit, where he described Meghan Markle as ‘nasty’.
Mayor of London Sadiq Khan has compared Donald Trump’s language to that of ‘a 20th century fascist’ and accused him of ‘shamelessly’ interfering in the Conservative party leadership race
Writing in the Observer, Khan said: ‘President Trump is just one of the most egregious examples of a growing global threat.
‘The far right is on the rise around the world, threatening our hard-won rights and freedoms and the values that have defined our liberal, democratic societies for more than 70 years.
‘This is a man who also tried to exploit Londoners’ fears following a horrific terrorist attack on our city, amplified the tweets of a British far-right racist group, denounced as fake news the robust scientific evidence warning of the dangers of climate change;
‘And is now trying to interfere shamelessly in the Conservative party leadership race by backing Boris Johnson because he believes it would enable him to gain an ally in Number 10 for his divisive agenda.’
The pair’s feud was sparked in 2016 when Trump challenged Sadiq to an IQ test after the Mayor said his views on Islam were ‘ignorant’.
The comments were made ahead of the US President’s three-day State visit to the UK, which starts tomorrow
Speaking to the BBC shortly afterwards, Sadiq Khan said: ‘Look it was Donald Trump that began this by saying his blanket ban on muslims would make an exception for me as Mayor of London.
‘And the point I made with respect to Donald Trump is there’s nothing exceptional about me. What about other Londoners who are business people, men and women, who happen to be muslim and want to do business in America?
‘What about other Londoners who want to go and study in America but happen to be muslim?’
They clashed again in June 2017 when the US President called Khan’s response to the London Bridge terror attack ‘pathetic’.
Khan had previously warned Londoners that there would be an increased police presence on the streets and that there was ‘no reason to be alarmed’.
Hundreds of thousands of protesters are expected in central London when Trump comes to meet Prime Minister Theresa May in Downing Street.
The ‘Trump baby’ blimp and a giant robot Trump sitting on a gold toilet are also likely to make an appearance.
What Twitter spats has Donald Trump had with the UK and why have they caused such offence?
While a Republican presidential candidate Donald Trump said there were ‘no go zones’ in London because of terrorism.
He said claimed parts of the city were ‘so radicalised’ the police force were ‘afraid for their own lives’.
The US President took to Twitter to hit out at Sadiq Khan’s ‘pathetic’ response to the London Bridge terror attack.
He sparked outrage in the UK when he tweeted: ‘At least 7 dead and 48 wounded in terror attack,’ the president wrote on his personal Twitter account, ‘and Mayor of London says there is ‘no reason to be alarmed!’
Critics pointed out that the London Mayor was saying residents should not be alarmed at the increased police presence.
Mr Trump wrongly linked the rise in crime in England and Wales to ‘Radical Islamic terror’.
The US president sent a tweet referring to figures out yesterday showing crime increased by 13 per cent last year and warning ‘We must keep American safe’.
But British MPs tore into Mr Trump for talking ‘nonsense’ and said he is ‘spreading fear and xenophobia’ by wrongly blaming the rise on terrorism.
UK-US relations took a battering when Donald Trump retweeted anti-Muslim propaganda put out by far right group Britain First.
Theresa May criticised the President saying he was ‘wrong’ to share the video.
Mr Trump hit back on Twitter: ‘Theresa, don’t focus on me, focus on the destructive Radical Islamic Terrorism that is taking place within the United Kingdom. We are doing just fine!’
Donald Trump tore into Britain’s NHS – branding the UK’s system of universal healthcare ‘broke and not working’.
He claimed that a major protest about the winter crisis in Britain’s hospitals in London at the weekend was a sign it is not a system the US should copy.
Health Secretary Jeremy Hunt hit back saying he is ‘proud’ of the NHS and no Brit wants to live in a US system where millions have no health cover at all.