The inquiry into allegations former Justice Minister Judith Collins tried to undermine former Serious Fraud Office boss Adam Feeley will begin a week before this year's September 20 election.
Prime Minister John Key this morning announced the terms of reference for a Government Inquiry into the matter which cost Ms Collins her portfolios.
Mr Key also said the inquiry would be conducted by former High Court Judge Lester Chisholm.
The Government Inquiry will have "full powers" under the Inquiries Act passed last year.
It will investigate whether: