Jonathan Djanogly, the Justice minister, has been reported to the Information Commissioner's Office (ICO) for his use of a private detective business in gathering information on the views of constituents.
The ICO said it had received a complaint but was not "at this stage" launching an investigation.
The issue was made public last year.
Mr Djanogly said last night: "I would never have condoned anything unlawful and dishonest in the investigations, and the investigators have assured me that all of their inquiries were carried out in an entirely lawful manner."
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