The Metropolitan police are to investigate Adam Werritty for possible fraud, following revelations that the close friend of the former defence secretary, Liam Fox, had been posing as an official advisor and sitting in on defence meetings.
The Labour MP, John Mann, has called for the investigation, citing Werritty's distribution of business cards, describing himself as Fox's advisor.
Mann is also reported to be liaising with the Electoral Commission to consider whether there should be a criminal investigation into Liam Fox's alleged failure to declare political donations.
The Electoral Commission is responsible for regulating political parties and their funding.
The Fox-Werritty revelations are currently being investigated by the Cabinet Secretary, Sir Gus O'Donnell. A report into the matter is due to be published early next week.