U.S. stock index futures tumbled on Monday as fears of a full-blown trade war and its impact on the global economy jolted markets around the world after President Donald Trump levied steep tariffs on Mexico,

Amid warnings of price increases, Canada moved quickly to retaliate, China said it had planned countermeasures and Mexico said it would soon unveil its response.

Shares of auto giants fell sharply on Monday as U.S. President Donald Trump imposed long-threatened tariffs on goods from Canada, Mexico and China.

President Trump says Americans could feel 'some pain' from the emerging trade war he triggered with tariffs against Canada, Mexico and China.

President Donald Trump said Sunday that Americans could feel “some pain” from the emerging trade war triggered by his tariffs against Canada, Mexico and China, and claimed that Canada would “cease to exist” without its trade surplus with the United States.

President Donald Trump has signed an order to impose stiff tariffs on imports from Mexico, Canada and China, drawing swift retaliation from the U.S.’s North American neighbors in an emerging trade war.

On Saturday, President Donald Trump made good on his promise to impose steep tariffs on America’s three largest trading partners — Canada, China and Mexico — citing a national emergency on the flow of fentanyl and undocumented immigrants into the United States.

President Donald Trump took action Saturday to impose new tariffs on Canada, Mexico and China, the White House said, which could have a sweeping impact on the American economy. The additional tariffs on Canadian and Mexican goods will be 25 percent,

American importers will pay a new 25 percent tax on goods from Canada and Mexico and a 10 percent levy on products from China.