MP George Galloway is to sue Blackpool Pleasure Beach for cancelling a radio show convention he had booked at the attraction this weekend.
Mr Galloway hosts a show on Talksport Radio
Mr Galloway claims the firm called off the event with just four days' notice over fears it would be too politicised.
The company has refused to comment, but in an email sent to the MP it said the contract allowed cancellation of events "prejudicial to commercial interests."
Mr Galloway estimates losses incurred by calling off the event at £100,000.
About 500 listeners to his "The Mother of all Talk Shows" programme on Talksport Radio had booked tickets to hear him speak at the site's Globe Theatre on Friday and Saturday.
Other entertainment included live music performances and a disco.
Mr Galloway, the Respect MP for Bethnal Green and Bow, said: "If you accept a booking from George Galloway MP and it is The Mother of All Talk Show's annual convention there is going to be some politics in there.
"If you are going to cancel, then you certainly can't cancel four days before the event."