US Set to Escalate Claim Mexico Corn Policy Violates Trade Deal

The US is preparing to accelerate its complaint that Mexico’s ban on genetically modified corn violates the nations’ free-trade deal, heightening tensions between neighbors.

The US Trade Representative’s office plans to request the formation of a dispute resolution panel under the US-Mexico-Canada Agreement on Thursday, according to people familiar with the matter, who asked not to be identified without permission to speak publicly.

The USTR press office declined to comment.

The panel of trade experts — whose findings are binding — would be charged with deciding whether Mexico’s corn policy is inconsistent with the trade pact. If the group sides ...