During the close to five years that National has been in power, John Key and his colleagues have kept a very tight lid on any argument, dissent or splits within the Cabinet.
Internal tensions, friction between ministers or divisions over policy have been kept so hidden from public view that you would be hard pressed to come up with an example. Not yesterday, however.
Two senior ministers chose to break their silence - and break ranks in the process - in the full media glare of a meeting of Parliament's privileges committee.
Justice Minister Judith Collins and Police Minister Anne Tolley were in high dudgeon, making it abundantly clear they were less than impressed with the actions of the David Henry inquiry into the leaking of the report by Cabinet secretary Rebecca Kitteridge into the workings of the Government Communications Security Bureau.
The privileges committee has moved with commendable speed in launching a probe into the Henry inquiry - for which Key has responsibility - particularly its requests for assistance from Parliamentary Service in retrieving data detailing Dominion Post journalist Andrea Vance's phone logs and movements around the parliamentary complex.