Trump sued over Canadian tariffs in latest legal challenge

US President Donald Trump faces another legal challenge over tariffs imposed on Canadian goods.

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US President Donald Trump is facing another legal challenge on tariffs after the group that successfully sued over his so-called "liberation day" import taxes filed a new lawsuit over the latest Canadian levies.

The White House imposed a 50% levy on some $20bn of Canadian goods after trade talks between the US and Canada broke down in August. The Liberty Justice Center filed a suit on behalf of US food business Gellert Global Group, urging the US Court of International Trade to find the levies unlawful and to order refunds with interest for affected importers.

The lawsuit argues the White House exceeded its authority in imposing the tariffs and caused "immediate harm to American businesses". The Liberty Justice Center is challenging the administration's use of Section 338 of the 1930 Tariff Act to hit Canadian goods from wine to dairy products and hockey sticks.

The lawsuit seeks to challenge the White House's reliance on retaliatory tariffs imposed by Canada to justify its own duties under Section 338. Canada has imposed a series of countermeasures against numerous US tariffs, including matching the Section 338 US tariffs "dollar for dollar" after Trump imposed them for what he called "unequal treatment" of US cars, dairy and alcohol.

The Liberty Justice Center is arguing that Section 338 requires a 30-day waiting period before levies can be imposed, but the tariff on products including cheese was added to the list just a week before tariff collection began. This is the latest in a series of legal challenges to Trump's trade policies.

Gellert Global Group, a third-generation family business, is paying 50% tariffs on cheese exported from Canada. The New Jersey-based firm is also facing retaliatory tariffs from Canada on American-made cheese it sells north of the border.

Co-chief executive Thomas Gellert said the firm had spent generations building relationships with suppliers and customers in the food industry. "These tariffs disrupt those relationships overnight and create costs and uncertainty that ripple through the entire supply chain," he said on Tuesday.