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strategy hit a snag when it became clear earlier this year that many of the assumptions underlying the work were "no longer valid," a newly released memo reveals.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Carney in the memo that "changes to Canada's strategic environment" meant work on a draft of the document was based on outdated premises.

The Canadian Press obtained a copy of the heavily redacted March 20 note through the Access to Information Act.

The memo, which was also sent to national security and intelligence adviser Nathalie Drouin, came less than a week after Carney was sworn in as prime minister.

Just days earlier, on March 9, Carney won the Liberal leadership a

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