The Prime Minister sounds genuinely surprised that somebody in a company operating Parliament's telephone system would give the records of a journalist's calls to an inquiry the Prime Minister had commissioned. John Key must not know his own power.
After more than four years in Parliament's highest office, he ought to know the shadow it casts over the public service and be wary of it. When an investigator acts in a PM's name it is a brave government employee or contractor who would stand in his way.
The phone company was contracted by the Parliamentary Service, a back-office operation that largely attends to the working needs of MPs. It was set up by Sir Geoffrey Palmer to serve the legislature, not the Executive, but in a parliamentary system the distinction is seldom clear.
Ministers are also MPs, the Prime Minister is the most senior of them. When an emissary from his office is anxious to find out how a document has got into the public domain, the Parliamentary Service would be inclined to help.
It is easy to say in retrospect that the most junior contractor should have known to stop short of revealing the telephone and swipe-card records of a journalist in the building. This happened before the debate over the use of "metadata" by the Government Communications Security Bureau and allied security agencies had reached its present intensity.