How Tariffs Are Shaking Up the War on Fentanyl

For years, even as fentanyl has killed Americans at an astonishing rate, Mexico has claimed that it was doing everything possible to crack down on production of the drug. This week, President Trump began using punishing new tariffs to test that claim. Natalie Kitroeff, who is the Mexico City bureau chief for The New York Times, discusses the surprising result of his tactics.