May I make a suggestion?
The Privy Council Office is the keeper of those documents, so I would say, “request of the Government of Canada” so that we are free to ask the ministers, as representatives of the Government of Canada, as opposed to asking the Clerk of the Privy Council, because then we're getting a third party involved.
I would say, “the Government of Canada”. Understand, however, that it's the Privy Council Office that is the keeper of cabinet confidences and documents.