President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE will "see that Londoners hold their liberal values of freedom of speech very dear," London's mayor Sadiq Khan said on Thursday, hinting that there may be protests during Trump's announced visit to the United Kingdom in July.

"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," Khan added in the tweet.

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. — Sadiq Khan (@SadiqKhan) April 26, 2018

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Khan and Trump, who have never met in person, have a contentious relationship over social media after Trump swiped at Khan last year just hours after a terrorist attack rocked the city of London.

"At least 7 dead and 48 wounded in terror attack and Mayor of London says there is 'no reason to be alarmed!'" Trump wrote in June, adding that London officials should “get down to the business of security for our people” and end political correctness.

Khan, meanwhile, has attacked Trump over the president's retweets of an anti-Muslim British hate group, Britain First, which also drew condemnation from Britain's Prime Minister Theresa May.

The London mayor, a member of Britain's Labour Party, said in November that an official visit by Trump “would not be welcomed" and that Trump was touting “a vile, extremist group" in his tweets.

Trump is scheduled to visit the country for a "working visit" with May this summer, after months of speculation over whether a state visit by the president to the U.K. would actually happen.

The visit was scheduled Thursday by press officials for the White House and 10 Downing Street, who said that more details about the trip would be forthcoming.