Green Party leader Zack Polanski repeatedly refused to apologise for sharing a photo of a man wearing a T-shirt with the message “We’re only making plans for Nigel” and an image of a guillotine.
Reform UK said the party had reported Mr Polanski to the police, with home affairs spokesman Zia Yusuf accusing the Green leader of “inciting murder” and Nigel Farage calling for his arrest.