Iowa farmers, export leaders, ag economists and others are working to highlight the value of the Mexican market for U.S. farm goods as the Trump administration begins the process of reworking the North American Free Trade Agreement (NAFTA).

The Trump administration appears to have throttled back some on its criticism of NAFTA. Still there is a big concern in agriculture that any push for restrictions on Mexican imports into the United States could spark retaliation and reduce sales of U.S.-grown corn, pork, eggs and other agricultural products. That concern has been heightened by reports that Mexico has started to look at other suppliers for its food needs, including Brazil, Argentina and Europe.

A loss of exports to Mexico could further weaken U.S. crop and livestock prices at a time when the farm economy is struggling. In ...