OTTAWA - The Liberal government's efforts to revise Canada's national security strategy hit a snag when it became clear earlier this year that many of the assumptions underlying the work were "no longer valid," a newly released memo reveals.

John Hannaford, the Privy Council clerk at the time, told Prime Minister Mark Carney in the memo that "changes to Canada's strategic environment" meant work on a draft of the document was based on outdated premises.

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