Premier Brad Wall and Potash Corp. of Saskatchewan are turning up the heat on Prime Minister Stephen Harper, with a barrage of statements suggesting BHP Billiton Ltd.'s proposed takeover would undermine Canada's strategic position in the global resource industry.

Mr. Wall's adamant rejection of the BHP deal and Potash Corp.'s effort to wrap itself in the Canadian flag are driving up the political cost that Mr. Harper will have to pay should his government allow the foreign acquisition, even if it insists on conditions that address some of the Premier's concerns.

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