Follow the latest news on the tariffs and other Trump administration moves. Leaders for Canada, Mexico, and China, including Justin Trudeau, respond after President Donald Trump imposes tariffs.

Trump’s move to impose new tariffs has bewildered the United States’ closest allies and trading partners, who have vowed to respond with levies of their own.

WASHINGTON— President Donald Trump on Saturday signed an order to impose stiff tariffs on imports from Mexico, Canada and China, drawing swift retaliation and an undeniable sense of betrayal from the country's North American neighbors as a trade war erupted among the longtime allies.