The disagreement stems from a 2009 U.S. requirement that retail outlets specify the country of origin on labels on meat and other products in an effort to give consumers more information about the safety and origin of their food.

Canada and Mexico have complained to the World Trade Organization that the COOL (country-of-origin labeling) rules discriminated against imported livestock.

The trade body ordered the United States to comply with WTO rules by May 23, but the U.S. government made revisions that Canada and Mexico say would only make the situation worse.

via Mexico says it may suspend U.S. trade preferences over meat labels | Reuters.