Sources say David Lametti lost a turf battle with Tom Pitfield, who shared the dual role of principal secretary.

Former justice minister David Lametti is leaving his position as Prime Minister Mark Carney’s principal secretary, less than three months after taking up the top political job, two sources say.

One of the sources said Mr. Lametti lost a turf battle with Tom Pitfield, who shared the dual role of principal secretary.

Mr. Pitfield is a long-time political strategist whose company Data Sciences, which he headed for years, provided digital operations for the Liberal Party. He moved into the PMO in March, resigning as chief executive of Data Sciences. Previously, Mr. Pitfield held the title of chief digital strategist under former prime minister Justin Trudeau and then Mr. Ca

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