Protesters paid £35 each to attend the Fabian Society in London, and demanded a citizens arrest of London Mayor Sadiq Khan
Khan was about to start speaking to the Fabian Society in London when he was disrupted by protesters, who shouted pro-Trump and pro-Brexit slogans.
It came after a tweet by Khan on Friday, in which he said Trump had "got the message" that he was "not welcome" in London after the President cancelled a planned visit to open the new US embassy.
In a video posted on social media, one protester could be heard saying: "Ladies and gentlemen, we're here today to make a non-violent, peaceful citizen's arrest."
As security began to appear, those in the audience started to heckle and slow-handclap.
But a demonstrator, unperturbed by the reception, said: "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."
The demonstrator also accused the Fabian Society of "subverting" the constitution.
Khan sat down and flicked through a newspaper while police escorted the demonstrators away.
Sky News political correspondent Laura Bundock said the protesters had been sitting "right at the front of the room", and delayed the start of Khan's speech for 15 minutes.
The group told her that MPs had "broken their oaths of office", adding that they were "employed by us, the people" and "should do as we say".
After paying £35 to get in, they said they were "heading to the pub afterwards".
Khan has called Donald Trump's policies "divisive", describing them as the "polar opposite" of London's values of "inclusion, diversity and tolerance".
When Khan resumed his speech he made light of the disruption with a reference to Theresa May's Tory conference speech last year, saying: "On the plus side, I wasn't served with a P45."
But then, surely that day grows closer every week Sadiq.
Earlier on Sky News :
Raheem Kassam laid into the Sky News yesterday saying they were not telling their viewers the whole truth about Khans London which he first called the acid attack capital of the world.
See full interview below : Kassam's attack on Mayor Khan comes 3:38 into the video.