Several major food companies have sent a letter to four U.S. senators and representatives urging Congress to direct Secretary of Agriculture Tom Vilsack to suspend revised country-of-origin labeling (COOL) rules on muscle cuts of meat because they discriminate against Canada and Mexico. The letter argues that if the WTO determines that the rule violates U.S. trade obligations, it could authorize retaliation from Mexico and Canada, which “has already issued a preliminary retaliation list targeting a broad spectrum of commodities and manufactured products that will affect every state in the country.” The new rules dictate that meat producers must disclose where their livestock was born, raised and slaughtered and can no longer commingle livestock from differing origins to ensure COOL accuracy. The food company coalition has also challenged the new U.S. Department of Agriculture rules in federal court, and the case is pending after an en banc rehearing in the D.C. Circuit. Additional information about the case appears in Issues 518 and 520 of this Update.