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Mr Khan’s speech at a Fabian Society new year conference was suspended for several minutes due to the incident. Police eventually managed to lead the demonstrators, believed to be from the White Pendragons, out of the venue. The protestors held up United States flags and called for Mr Khan to be arrested, saying power had gone to his head A spokeswoman for the Fabian Society confirmed to Express.co.uk the speech had been marred by what she described as "far right" protestors. The protestors not only threatened to make an citizen’s arrest of the London mayor but also Sir Keir Starmer, the shadow Brexit secretary and the panel’s chair Kate Green MP as well as general secretary Andrew Harrop.

Reuters A speech by London mayor Sadiq Khan was disrupted by protestors

In video footage of the incident one man could be heard saying: "Ladies and gentlemen, we're here today to make a non-violent, peaceful citizen's arrest of those being named. “They are Sadiq Khan, Keir Starmer, Kate Green MP and Andrew Harrop. “We stand under common law jurisdiction. If you touch us you will be done for common assault. Do not touch us. We're not leaving, I've paid for a ticket.” Audience members started to heckle and slow-clap, during which security appeared.

Reuters Protestors disrupted a speech by London mayor Sadiq Khan

Amid chants of “scum,” Ms Green said: “I can assure you nobody is leaving and when the police arrive you will be able to talk to them. “Those who who would like to speak to the police can do so when they arrive. those who want to have a discussion about the future Labour government can stay in this hall.” The protest was apparently against comments made by the Mayor of London about Mr Trump's plans to cancel his trip to the UK. The group entered the conference moments before Mr Khan was due to make his keynote speech.

Reuters A protestor holds up an anti-EU banner during Sadiq Khan's speech to the Fabian Society

Their attempts to eject the protestors for the disruption were initially met with aversion from the protesters, one of whom could be heard saying: "We stand under Common Law jurisdiction. "If you touch us, you'll be done for common assault. Please stand back, do not touch us. "We're not leaving, we've paid for a ticket." He then accused the Fabian Society of "subverting" the constitution.

Reuters Police attempted to remove the protestors from the London venue

Reuters London mayor Sadiq Khan addresses the Fabian Society in London