SADIQ Khan has taken another swipe at his arch enemy Donald Trump, saying Brits will be sure to exercise their "free speech" by protesting if he comes to the capital.

The London Mayor issued a warning to the US President after it was announced he will officially visit the UK for the first time in July.

2 Mayor of London Sadiq Khan has called for protests against Mr Trump Credit: EPA

Donald Trump says new Mayor of London Sadiq Khan is 'very rude'

The trip will take place on Friday the 13th - after Mr Trump stops off in Brussels for a summit of Nato leaders.

But Mr Khan - who has clashed repeatedly with him on several occasions - issued a thinly vieled warning that he will face angry protesters if he comes to London.

The Mayor tweeted: "If he comes to London, President Trump will experience an open and diverse city that has always chosen unity over division and hope over fear.

"He will also no doubt see that Londoners hold their liberal values of freedom of speech very dear."

2 Mr Khan and the US President have repeatedly fought with each other on Twitter Credit: Getty Images - Getty

Sadiq Khan repeats opposition to Trump's state visit calling it 'inappropriate'

The London Mayor has repeatedly said the US President should not get a state visit when he comes, and the pair have fallen out repeatedly online.

Mr Trump attacked him after the London Bridge attacks which left eight dead, but Mr Khan said he was acting like a 12-year-old.

Later on a spokesperson for Khan said that President Trump had taken the Mayor’s words out of context, but the President tweeted again, calling it a “pathetic excuse.”

Mr Khan said the abuse he's got online has got even worse since he started fighting with the US President too - with one sick user telling him to "blow himself up".

And after the US President re-tweeted messages from Britain First, Mr Khan slammed him for sharing "vile, hate-fuelled" tweets.

He also was vocal in calling out Mr Trump's travel ban, which targeted people form mainly Muslim countries.

Hilarious moment President Trump brushes a bit of dandruff off French President Macron's shoulder

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Today it was revealed that the long-awaited trip will come in 11 weeks time, after repeated delays.

But it won't be a full state visit hosted by the Queen - instead, it will involve a series of political meetings and last just one day.

A spokesman for Theresa May said: "The President of the United States will visit the UK on 13 July.

"He will hold bilateral talks with the Prime Minister during his visit. Further details will be set out in due course."

Ex-London Mayor Boris Johnson responded with joy at the news, tweeting: "FANTASTIC news that President @realdonaldtrump will at last come to Britain on 13 July. Looking forward to seeing our closest ally and friend on the GREATest visit ever."