Canadian truckers have blasted a U.S. proposal that would greatly hike some fees at the border.

The fleet group, the Canadian Trucking Alliance, says it strongly objects to a proposal from the U.S. Department of Agriculture to substantially raise the Animal Plant and Health Inspection Service fees.

In filing comments in response to the USDA’s Notice of Proposed Rulemaking, CTA said the group believes the fees may be illegal under the North American Free Trade Agreement, which prohibits customs user fees, and the General Agreement on Tariffs and Trade, which says that all fees and charges shall not represent an indirect protection to domestic products or a taxation of imports or exports for fiscal purposes.

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