Hundreds of Canadian workers, many in the steel and aluminum sectors, have been laid off as a result of U.S. President Donald Trump's tariffs, according to a major union and companies. Economists warned this was only the beginning as the impact of tariffs is expected to broaden the longer they are in place.

US steel and aluminium tariffs have triggered 200 job losses in Canada, with 100,000 more at risk as trade uncertainty intensifies.

Prime Minister Mark Carney says Canada will fight back against President Donald Trump’s trade war and his tariffs on the auto sector, but he declined to outline new retaliatory moves against the US on Thursday.

Along with Wisconsin, 11 other states and Washington D.C. are part of the digital billboard blitz funded by the Canadian government.

Billboards such as those spotted in the Metro Detroit area this week read, "Tariffs are a tax on your grocery bill."

Canada is trying to persuade Americans to speak out against President Trump’s trade war by launching an ad campaign in 12 red-leaning states, pushing anti-tariff messages and reminding them that “nobody will win” with the approach coming from the White House.

Winners include Tesla, and to a lesser extent, Ford. Losers include Canada, steelworkers, and US consumers with fewer choices. Here's what to know.

President Trump said he would impose 25% tariffs on global automotive imports to the U.S., which would be added on top of other tariffs. Here’s what to know. What’s covered? Finished cars and auto parts that aren’t made in the U.