Former President Donald Trump has warned that he would move to block the opening of a $4.7 billion bridge connecting the United States and Canada unless what he calls a “major change” is made to existing cross-border arrangements.

The project in question is the Gordie Howe International Bridge, a long-anticipated infrastructure development linking Detroit, Michigan, to Windsor, Ontario. Years in the making, the bridge has been promoted as a critical trade corridor expected to ease congestion and modernize one of North America’s busiest commercial crossings.

In recent remarks, Trump criticized aspects of the agreement governing the bridge’s operations, arguing that the current structure disadvantages American interests. He did not outline specific legal steps but suggested that future federal action could delay or prevent the bridge from opening under its present terms.

The Gordie Howe International Bridge has been described by transportation officials as a once-in-a-generation investment in cross-border infrastructure. According to project updates published by the official bridge authority website, construction has progressed steadily, with major structural components nearing completion.

The bridge is intended to complement the Ambassador Bridge, a privately owned crossing that has long handled a substantial share of U.S.-Canada trade. Government officials in both countries have argued that the new span will increase capacity, improve security coordination, and strengthen economic ties.

Trump’s warning has introduced fresh uncertainty into a project that has already navigated years of political and legal debate. Supporters of the bridge say it represents a strategic investment in supply chains, particularly in the automotive and manufacturing sectors that rely heavily on cross-border shipments.