A spokeswoman for the Standards Commissioner Kathryn Hudson, has said she "would consider the case for investigating Tory MP Patrick Mercer within a working week".
Mercer today announced he was resigning the party whip amid media reports that he broke Parliamentary rules while lobbying for Fiji.
Conservative MP Patrick Mercer has been accused of breaking parliamentary rules by offering to provide a Commons pass for lobbyists.
The Conservative MP, who is alleged to have lobbied on behalf of Fiji, posed several questions about the country to Parliament this year.
Patrick Mercer MP spent 25 years in the Army before entering politics.