Councillor Christopher Hudson, who represents Belstead Brook in Suffolk, resigned from the Conservatives on Friday.
Mr Hudson has joined Reform UK.
The East Anglian Daily Times quotes Mr Hudson as saying: "Unfortunately, the broken manifesto promises over stopping the boats, safeguarding our borders, keeping taxes low and reducing them have all been betrayed."
https://twitter.com/cllr_hudson/status/1832095330696929517
