For free traders like me, the recently negotiated United States-Mexico-Canada Agreement, or USMCA, is a mixed bag of trade-enhancing and trade-restricting changes to the current North American Free Trade Agreement. My support for the new deal in the coming weeks, and perhaps that of many of my Republican colleagues, will depend on the steps the president takes to strengthen it.
On the positive side, the USMCA enhances the current Nafta with a new section covering digital trade, broader intellectual property-rights protections,…