Trump administration says tariffs on Mexico, Canada and China critical to preventing fentanyl and other drugs from pouring across the U.S. border, and are not part of an international trade war.

President Donald Trump's steep tariffs on Canada, Mexico and China could worsen ex­ist­ing drug short­ages in the U.S. and raise healthcare costs for patients, some drug trade groups warn.  They also said the import taxes could strain cash-strapped generic drugmakers and distributors.