With today’s implementation of tariffs on both sides of the Canada-U.S. border, the level of mistrust between our countries has grown, whether urgent calls to “Buy Canadian” or boos and catcalls at the playing of the American national anthem. Should we continue down this path, Mr. Trump will surely seek to exploit more of Canada’s potential vulnerabilities. Last week, I co-wrote an op-ed with Kumanan Wilson on one such vulnerability: our health data, whose protection has yet to attract much attention but which could emerge as an issue.

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