British Labour Party leader Jeremy Corbyn said Monday that protesting President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE's visit to the United Kingdom is a chance to "stand in solidarity" with those he has attacked.

"Tomorrow's protest against Donald Trump's state visit is an opportunity to stand in solidarity with those he's attacked in America, around the world and in our own country - including, just this morning, @SadiqKhan," Corbyn tweeted.

Tomorrow's protest against Donald Trump's state visit is an opportunity to stand in solidarity with those he's attacked in America, around the world and in our own country - including, just this morning, @SadiqKhan. — Jeremy Corbyn (@jeremycorbyn) June 3, 2019

Trump arrived in the U.K. on Monday morning for a three-day state visit.

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The president is expected to face thousands of demonstrators during his visit to London.

Corbyn, who has been a vocal critic of Trump, referenced Trump's comments over the last two days about London Mayor Sadiq Khan in his tweet.

On Sunday, Trump mocked Khan, another critic of his.

“No, I don’t think much of him," he told reporters. "I think he’s, he’s the twin of [Bill] de Blasio, except shorter.”

On Monday he blasted the London mayor as a "stone cold loser."

Khan wrote in a fiery op-ed on Saturday that the United Kingdom is on the “wrong side of history” ahead of Trump's visit.

“In years to come, I suspect this state visit will be one we look back on with profound regret and acknowledge that we were on the wrong side of history,” Khan wrote in The Guardian.

Ahead of his visit to the country, Trump also called comments the Duchess of Sussex, Meghan Markle Meghan MarkleTrump wishes Prince Harry 'luck' with Meghan Markle after Biden endorsement: 'Not a fan' Meghan Markle and Prince Harry call on voters to 'reject hate speech' and 'misinformation' Does Kamala Harris's music matter? MORE, made about him “nasty.”