North Somerset Council was given the go-ahead last week by central Government to knock-down the dilapidated Tropicana building.
Demolition work is due to start in the autumn.
But local councillor and leader of the Liberal Democrats on the council, Mike Bell told The Bristol Post: “We will support legal efforts by campaigners to block the demolition until alternative plans to save the Tropicana have been given a fair hearing and I for one will chain myself the bulldozers to try to prevent demolition.”
Consortium Trop (WSM) Ltd has already put forward plans to redevelop the Tropicana and offered to buy it from the authority for £1.
The consortium, led by businessman Derek Mead, is seeking an injunction to stop the bulldozers moving on to site at the same time as it lodges an appeal against the planning decision.
Mead said: “We will be appealing the decision by the Secretary of State to grant planning permission for the demolition of the Tropicana.
“We will also be serving an injunction on the council to prevent them from moving the bulldozers on to the site. What we are asking for is a public inquiry on the matter.”
The Tropicana has been vacant for 12 years and more recently has been used as a storage depot by contractors Birse during a £29-million project to enhance the resort’s sea defences.North Somerset Council spokesman Richard Turner said: “We have yet to receive an injunction. It is still our intention to demolish the Tropicana.”