U.K. Prime Minister Keir Starmer has been issued with a formal letter of claim after several foreign politicians, commentators, and activists were blocked from entering the United Kingdom ahead of a major rally in London last weekend.
The legal threat was announced on Saturday by Dutch commentator Eva Vlaardingerbroek, who said she and others had instructed a lawyer to act on their behalf over potentially defamatory remarks made by the prime minister last week.
“Today, Dominik Tarczyński, Don Keith, Ada Lluch, Joey Mannarino, and I have formally instructed our lawyer, Francesco Gargallo di Castel Lentini, to issue a Letter of Claim to Keir Starmer,” Vlaardingerbroek wrote on X. The lawyer mentioned is Vlaardingerbroek’s Italian husband.
Enough is enough.
Today, @D_Tarczynski, @RealDonKeith, @AdaLluch, @JoeyMannarino and I have formally instructed our lawyer, @Fr_Gargallo, to issue a Letter of Claim to @Keir_Starmer. The letter demands that he immediately retract his defamatory statements in which he labelled us… pic.twitter.com/myseUDpc8U
— Eva Vlaardingerbroek (@EvaVlaar) May 16, 2026“The letter demands that he immediately retract his defamatory statements in which he labelled us ‘far-right agitators’ who wish to incite violence.
“Should he fail to comply, we reserve all our legal rights to pursue further action against him.”
The dispute follows a speech delivered by Starmer last Monday in which he said his government had barred what he described as “far-right agitators” from entering Britain to attend the Unite the Kingdom march organized by Tommy Robinson.
The demonstration took place in London on Saturday. Ahead of the event, those named in the letter received notices from the Home Office informing them that their U.K. Electronic Travel Authorisation (ETA) had been cancelled. The message stated that their presence in Britain was not considered “conducive to the public good.”
Among those affected was Polish MEP Dominik Tarczyński, a conservative politician and outspoken opponent of mass migration.
“This is what communism looks like in the 21st Century. I have just been denied entry to the U.K. in order to speak at the largest patriotic event in Europe,” Tarczyński wrote on social media after being refused entry.
In total, 11 people were reportedly banned from entering the U.K. to attend the rally. They included American nationals, Don Keith and Joey Mannarino, and Spanish conservative influencer Ada Lluch.
Mannarino wrote in response, “None of us want to incite violence. None of us are agitators. We are simply people who want to see Europe remain Europe, the U.K. remain the U.K., America remain America, and so on.”
The letter of claim, dated May 13, was addressed to Starmer at 10 Downing Street and described the prime minister’s remarks as “potentially defamatory, untrue and denigratory.” It said the statements had been made against private citizens, parliamentarians, and lawyers, and demanded a formal retraction.
The row also comes amid broader warnings issued ahead of those attending the London protest. The Metropolitan Police cautioned that certain placards and chants could amount to hate crimes and lead to prosecution.
Those warnings followed new guidance from the Crown Prosecution Service on acts that may be treated as stirring up hatred.
Director of Public Prosecutions Stephen Parkinson defended the guidance, saying, “This is not about restricting free speech. It is about preventing hate crime and protecting the public, particularly at a time of heightened tensions.”
