President Donald Trump said he would plow ahead with new tariffs on Canada and Mexico starting Tuesday, a broadside against the two biggest US trading partners that underscores his push to remake global trade.

New tariffs on Canada, Mexico and China went into effect Tuesday as part of President Trump’s effort to use trade measures to halt the flow of fentanyl into America – and Canada has already retaliated.

US President Donald Trump is standing firm on the announced tariffs on goods from Mexico and Canada. "They’re all set. They go into effect tomorrow," Trump said on Monday in Washington, in response to a question about whether there was still a chance for an agreement.

Canadian Prime Minister Justin Trudeau announced on Monday night that his country will retaliate against the U.S. if President Donald Trump goes through with his plan for tariffs on Canadian goods, which are set to take effect at 12:01 a.

Canadian Prime Minister Justin Trudeau said he wouldn’t allow President Trump’s tariff decision to “go unanswered,” and set in motion the imposition of retaliatory tariffs targeting about $100 billion of U.

If the Trump administration follows through on its threat to impose new tariffs on imports from Canada and Mexico, America’s neighbors are expected to hit back with their own taxes on U.S. imports. So which American products are big in Canada and Mexico?

As Donald Trump's tariffs on Canada are set to activate, Canadian Prime Minister Justin Trudeau said he would respond promptly with tariffs for America. Canada Prime Minister Justin Trudeau said Monday that “there is no justification” for Trump’s tariffs.