Members of the Green party in East Devon are calling for an inquiry to be held into the actions of a Conservative councillor.
Sharon Pavey, town councillor for Honiton, claims video footage, released after a Daily Telegraph investigation, calls into question what Graham Brown "has been going on for all the period of time when he has been influential in the council".
She said: "I am calling for an inquiry.
"I want to know whether he has had any influence on his fellow Tories, and, if so, how many planning decisions have been affected.
"Is there going to be a police investigation? These actions are wholly unacceptable, and possibly illegal. We expect EDDC to react swiftly and for anyone implicated to get their resignations in today."
Cllr Brown has defended the comments he made during a conversation to national newspaper reporters working undercover during which he said "if I can't get planning, nobody will".
He is the chairman of the East Devon Business Forum, and runs a planning consultancy business, Grey Green Planning.
As the Echo has reported, when speaking to Daily Telegraph reporters, posing as representatives from an overseas investment company, he said: "I'm the best. If I can't get planning permission, no one will.
"I don't come cheap. If I'm turning a green field into a housing estate and I'm earning the developer two or three millions – then I'm not doing it for peanuts. Especially if I'm the difference between winning and losing it."