Labour MP Jessica Morden has led criticism of government plans for directly elected Police Commissioners.
Opening a Westminster Hall debate on 14 September, the MP for Newport East said the proposals were a "costly diversion" and would not make any difference in tackling crime.
She also claimed that there had been a lack of consultation on the plans, an accusation rejected by Policing Minister Nick Herbert.
Under the proposals, each force in England and Wales would have a directly elected Police Commissioner, who would set priorities for the force and its Chief Constable.
They will also be able to hire or fire chief constables.
Every force area, except London, will elect a commissioner in May 2012.
A commissioner will be elected for four years and for a maximum of two terms.