President Trump said late Monday that he plans to impose a 25 percent tariff on products from Canada and Mexico starting Feb. 1, and possibly on most U.S. imports, while signing an executive order directing federal agencies to conduct a comprehensive review of U.S. trade policy by this spring. Speaking to reporters in the Oval Office on Monday night, Mr. Trump said he was considering imposing tariffs on Mexican and Canadian products because those countries allow "a lot of people to come in, and with that fentanyl". Asked when the measures would be implemented, Mr. Trump said: "I think we will do it on February 1."