The House of Representatives has voted against the US president's use of "emergency" powers in the trade war with Canada

President Donald Trump has warned Republican lawmakers they will face political "consequences" after the House of Representatives voted to roll back some of his tariffs on Canada.

In a pair of posts on his Truth Social platform on Wednesday, Trump accused Canada of taking advantage of the United States and defended tariffs as a key pillar of his economic and national security strategy.

"Any Republican, in the House or the Senate, that votes against TARIFFS will seriously suffer the consequences come Election time, and that includes Primaries!" Trump wrote.

The House voted 219-211 to pass a resolution aimed at ending economywide tariffs imposed on Canada under an "emergency" declaration supposedly related to fentanyl trafficking at the northern border. Six Republicans joined Democrats in supporting the measure, which challenges Trump's use of the International Emergency Economic Powers Act (IEEPA).

Even if the measure clears the Senate, Trump is expected to veto it, and supporters lack the two-thirds majorities needed in both chambers to override it.

Trump declared the fentanyl emergency last year to justify 35% tariffs on Canadian goods under IEEPA. Canada is also subject to separate sector-specific tariffs on steel, aluminum, automobiles, and lumber imposed through other presidential authorities.

The House vote followed a procedural shift that forced lawmakers to take up the issue after months of avoiding direct votes on Trump's tariff policies. It also comes as the US Supreme Court weighs the legality of the president's continued reliance on IEEPA, with several justices expressing skepticism during a hearing last November.

The clash over tariffs is the latest flashpoint in increasingly strained US-Canada relations. Earlier this week, Trump threatened to block the opening of the new Gordie Howe International Bridge between Ontario and Michigan unless the United States receives partial ownership of the crossing. He has also warned of steep tariffs on Canadian-made aircraft and punitive measures if Ottawa deepens trade ties with China.

Canadian Prime Minister Mark Carney has rejected claims that Canada is pursuing a free-trade agreement with Beijing and has urged Washington to respect Canadian sovereignty.