The Globe and Mail reports in its Monday edition that Canada could enhance its legal efforts in the U.S. to challenge President Donald Trump's tariff powers if businesses and governments share how they have been harmed by his actions, say American lawyers. The Globe's Nathan VanderKlippe writes that at least five court cases argue Mr. Trump is unlawfully using emergency legislation to impose tariffs. Success in these cases could overturn existing tariffs and limit his ability to impose new trade measures. Canadian involvement in these cases could be beneficial, though it must be balanced against potential backlash from the White House. Commenting on U.S. court cases challenging Mr. Trump's powers poses risks, especially since Canada is negotiating a new economic relationship with the U.S., where many products can enter tariff-free under the USMCA. The Canadian government's cautious approach is necessary to avoid provoking President Trump, noted international trade specialist Brenda Swick, who added that legal challenges can serve as leverage in negotiations. Law professor Ilya Somin believes standing firm against a "bully" may compel concessions, especially if court rulings threaten to overturn Mr. Trump's actions.