As U.S. President Donald Trump sticks with his campaign of tariffs on imports from Canada, some American industries are accusing Canadian competitors of using cheap materials from China in ways that violate free trade rules and undercut U.S. companies.

The accusations emerged during recent public hearings in Washington into the future of the Canada-U.S.-Mexico Agreement (CUSMA). During the hearings, leaders from a wide range of business sectors urged the Trump administration to renew the trade deal when it comes up for review in July.

However, several industries — from steel producers to truck-parts suppliers to kitchen-cabinet makers — expressed concerns that some Canadian and Mexican companies are exploiting CUSMA’s preferential trade terms by sending products with significant amounts

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