By Alex Nino Gheciu -CP-The CEO of the Toronto International Film Festival is warning against an overly nationalistic approach to screen content in Canada, as U.S. President Donald Trump’s looming tariffs have led some to shun American exports. The Canada-first approach to film could ultimately harm the industry, Cameron Bailey said on a virtual call from Toronto on Thursday. He noted TIFF has been closely watching the trade tensions and their potential impact on the economy. But beyond tariffs, which could increase costs for both filmmakers and festival organizers, TIFF is concerned about a potential “sentiment shift” among viewers and creators. “That’s what we’re really keeping a close eye on: that difference between pride in Canadian screen stories and a kind of closing down and a purely nationalistic approach to…