By CCN.com: Donald Trump slammed London mayor Sadiq Khan as he touched down in the UK on Monday. The president referred to Khan as “nasty” and compared the “stone cold loser” to a shorter version of “dumb and incompetent” New York Mayor Bill de Blasio.

“Sadiq Khan who by all accounts has done a terrible job as Mayor of London, has been foolishly “nasty” to the visiting President of the United States, by far the most important ally of the United Kingdom. He is a stone cold loser who should focus on crime in London, not me……”

.@SadiqKhan, who by all accounts has done a terrible job as Mayor of London, has been foolishly “nasty” to the visiting President of the United States, by far the most important ally of the United Kingdom. He is a stone cold loser who should focus on crime in London, not me…… — Donald J. Trump (@realDonaldTrump) June 3, 2019

Trump’s fierce words come as Khan criticized the British government for “rolling out the red carpet” for the US president. The clash marks the start of Trump’s three-day state visit to the United Kingdom, where he will have lunch with the Queen and meet various members of the royal family.

U.S. President Donald Trump lands in London, marking the start of his three-day official state visit to the U.K. https://t.co/cckyewZnlN pic.twitter.com/TBZU5iSySZ — CNBC International (@CNBCi) June 3, 2019

Khan: Trump is the “antithesis of London values”

Sadiq Khan yesterday criticized the British government for pandering to Donald Trump and said the country is wrong to “roll out the red carpet” for the president.

“I think it’s important for us to have good relations with our closest ally, and important for our allies to be here for the 75th anniversary of the D-Day landings; we’ve got to have good relations with the US – but I don’t think we should be rolling out the red carpet.”

He went on to say that outgoing prime minister Theresa May should have the courage to stand up to Trump. Khan argued that Trump’s divisive policies are the antithesis of London’s diversity.

“Our closest ally is akin to a best friend – and the thing about a best friend is that you stand shoulder to shoulder with them in times of adversity, but you’ve got to call them out when you think they’re wrong… There are so many things about President Donald Trump’s policies that are the antithesis of our values in London, but also our values as a country.”

Trump: Khan has done a “terrible job as Mayor of London”

Trump hit back at Khan, slamming his performance as London mayor. Trump compared him to New York mayor Bill de Blasio. This comparison is a Trump favorite. Earlier this week Trump called Khan “the twin of de Blasio, except shorter.”

….Kahn reminds me very much of our very dumb and incompetent Mayor of NYC, de Blasio, who has also done a terrible job – only half his height. In any event, I look forward to being a great friend to the United Kingdom, and am looking very much forward to my visit. Landing now! — Donald J. Trump (@realDonaldTrump) June 3, 2019

“….Kahn reminds me very much of our very dumb and incompetent Mayor of NYC, de Blasio, who has also done a terrible job – only half his height.”

War of words ahead of UK state visit

Trump has been on something of a rampage before his British state visit. In an interview with British press, he weighed in on Brexit, calling for the UK to crash out of the EU without a deal (a catastrophic option, by almost every independent analysis).

Trump also threw his weight behind occasionally-racist prime ministerial candidate Boris Johnson and suggested the EU send Nigel Farage, a hard right-wing politician, to negotiate Brexit. He saved a few critical words for the new Duchess of Sussex, calling her “nasty.”

The US president will spend three days in the UK. Today he will have lunch with the Queen before meeting the Prince of Wales for tea.