U.S. agricultural imports from Mexico have been growing and there is a trade deficit; Mexico’s agricultural imports from the U.S. are stagnant at best. Mexico is self-sufficient in white corn for human consumption but imports yellow corn for animal feed. Now Mexican President André Manuel López Obrador wants to ban GM corn to help his country’s maize growers. The ban on GM corn likely violates the USMCA and will hurt the country’s livestock producers. Mexico’s imports of pork and poultry have already been increasing. If Mexico blocks imports of yellow feed corn from the U.S., it will drive American prices lower, making its livestock exports even more competitive. Then Mexico City will be under pressure...