Stephen Harper has blocked one of the most controversial foreign takeovers in Canadian history, a remarkable about-face for an avowed free trader that sends confusing signals on this country's enthusiasm for outside investment.

Industry Minister Tony Clement announced late Wednesday that the Harper government has rejected Australia-based BHP Billiton Ltd.'s $38.6-billion (U.S.) hostile bid for Potash Corp. of Saskatchewan, a decision made in the face of a fiercely populist backlash against the deal.

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