WASHINGTON — President Donald Trump said in a letter that he will raise taxes on many imported goods from Canada to 35%, deepening a rift between two North American countries that have suffered a debilitating blow to their decades-old alliance.

The threatened tariff was the latest in Trump’s on-and-off tax on imports from around the world. But among the three largest U.S. trading partners, Trump reached a framework for talks with China and still doesn’t have agreements with Canada or Mexico.