WASHINGTON, D.C. — Two characters with rival ambitions who have not always seen eye to eye are suddenly compelled to work together to take on a common antagonist …

It could be the theme of a superhero flick, but it’s the reality of U.S. President Donald Trump’s trade war that has Prime Minister Mark Carney and Mexican President Claudia Sheinbaum reaching for their capes. They hope their newfound cooperation can serve up a plot twist in the upcoming renegotiation of the Canada-U.S.-Mexico Agreement (CUSMA).

Last week, the two North American leaders met in Mexico City to expand both their economic and security ties, deepening their trade pact ahead of talks about the renewal of the free trade agreement. Both worry that the White House’s demands may prove disruptive in negotiations, so they

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