As London Mayor Sadiq Khan prepared to take the stage at the yearly Fabian Society conference on Saturday, he was interrupted by American flag-holding Trump supporters who attempted to stage a "citizens arrest".
In a video posted on social media, one man could be heard saying: "Ladies and gentlemen, we're here today to make a non-violent, peaceful citizen's arrest". That didn't pan out.
Khan reportedly sat down and flicked through a newspaper as he waited for the commotion to die down and the protesters to be escorted out.
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The demonstration follows US President Donald Trump's cancellation of a planned visit to the United Kingdom capital next month. "But they told us Sadiq Khan has no right to be Mayor of London, referencing his religion".
Audience members started to heckle and slow-clap, during which security appeared.
Mr Khan added: "It is a pleasure to be here even though we were distracted by the actions of what some would call very stable geniuses".
As attempts were made to eject them, one of the protestors could be heard saying: "We stand under Common Law jurisdiction".
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"We're not leaving, we've paid for a ticket".
The protestor then accused the Fabian Society of "subverting" the constitution.
Yesterday, Khan tweeted a statement that "President Trump got the message" from Londoners who disapprove of his "divisive agenda" after he cancelled a trip to the UK.
Trump said he abandoned his plans to visit the United Kingdom as he is "not a big fan of the Obama Administration" selling off the previous embassy and building a new one in an "off-location".
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Mr Trump recently used the words "stable" and "genius" to describe himself.