Mexican President Claudia Sheinbaum says that the incoming U.S. president’s plan to institute massive tariffs on Mexican imports would bring about mutually assured economic destruction.

President-elect Trump says he will add a 25 percent tax on goods from Canada and Mexico on his first day in office.

While the announcement is almost certainly bluster to bring attention to illegal immigration and fentanyl smuggling, there are several reasons why it is so risky.