President Trump plans to impose stiff tariffs on Mexico, Canada and China on Saturday, a move aimed at pressuring America’s largest trading partners into accepting more migrants and halting the flow of migrants and drugs into the United States.

       Mr. Trump will put a 25 percent tariff on goods from Mexico and Canada, along with a 10 percent tariff on Chinese products, Karoline Leavitt, the White House press secretary, said in a news briefing Friday.

       Speaking to reporters in the Oval Office on Friday, Mr. Trump said the tariffs were punishment for Canada, Mexico and China allowing drugs and migrants to flood into the United States.

       Mr. Trump’s decision to hit America’s trading partners with tariffs could mark the beginning of a disruptive and damaging trade war, one that is far messier than the conflict that defined Mr. Trump’s first term.

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       Back then, Mr. Trump placed tariffs on nearly two-thirds of Chinese imports, resulting in China hitting the U.S. with levies of its own. Mr. Trump also imposed tariffs on steel and aluminum, inciting retaliation from the European Union, Mexico and Canada.

       While the tariffs against allies were viewed as controversial, they were relatively limited in scope. It remains to be seen exactly what products Mr. Trump’s new tariffs apply to, but the president has implied that they would be expansive and cover imports from Canada and Mexico, close allies of the United States.

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