Mexico and Canada responded to the U.S. trade action with a 25% tariff against $155 billion worth of American goods as trade war kicks off next week.

Stock markets around the world saw sharp declines in response to President Trump’s imposition of tariffs and retaliatory actions by Canada and Mexico.

NBC News' Brain Cheung and Gabe Gutierrez report on the impacts and reaction to President Trump's tariffs on Canada, Mexico and China and the president's talks with other nation's leaders.

What to know as President Donald Trump imposes steep new tariffs on imports from Canada, Mexico and China, prompting ...

Paul Krugman and Larry Summers are among the economists warning that Trump's tariffs may drive up prices, trigger job losses ...

Global stock markets slumped, the dollar strengthened, oil prices rose, with U.S. stock market futures down sharply Monday, ...

Prime Minister Justin Trudeau is expected to speak with President Donald Trump on Monday morning as Canada's leaders scramble ...

Markets have tumbled this morning after Trump announced tariffs on Mexico, Canada and China – with the threat that Europe is ...

Global stocks are tumbling after President Donald Trump imposed 25% tariffs on most imports from Canada and Mexico and 10% on ...

Ahead of tariffs starting Tuesday, President Donald Trump posted on social media that he spoke Monday morning with Canadian ...

Worries about President Donald Trump’s tariffs are hurting U.S. stocks Monday as financial markets worldwide drop on concerns ...

President Donald Trump said he spoke with Canadian Prime Minister Justin Trudeau Monday morning as fallout continues from ...