President Trump tussled with Canada over tariffs on Tuesday as hikes against steel and aluminum imports are set to take effect.

President Trump says his 25 percent tariff on imports from Canada will go into effect on Tuesday, despite Canadian officials’ efforts to persuade their American counterparts that they have improved border security.

One Democratic senator offered an unexpected example of how he says President Donald Trump’s tariffs would hurt farmers and small businesses in his home state and across the country: Canadian-made aluminum pie pans.

Republican lawmakers are growing alarmed over signs that President Trump’s expanding trade war is hurting the economy, something they’re hearing from constituents at home who are struggling to adapt to Trump’s zigzagging tariff pronouncements.

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President Trump is doubling down on his widespread tariffs threats despite a stock market downturn that has helped fuel anxiety the nation could slide into a recession. Trump escalated the tit for tat with Canada on Tuesday when he said his administration would increase planned steel and aluminum tariffs in response to an electricity surcharge