President Donald Trump said he would seek to renegotiate the terms of the Gordie Howe International Bridge linking Michigan and Ontario, threatening to block its opening unless the United States receives compensation and partial ownership of the project.

In a social media post on Monday, Trump said the bridge would not open until the US is “fully compensated” and argued that Canada should grant the United States ownership of “perhaps at least one half” of the asset.

He said negotiations would begin immediately. The post included an image of the six-lane bridge connecting Detroit and Windsor, which is nearing completion pending final testing and regulatory approval.

The Gordie Howe International Bridge is expected to become the largest port of entry on the US-Canada border by capacity, according to the US Department of Transportation.

According to Bloombr report, the project was fully financed by the Canadian government at an estimated cost of 6.4 billion dollars, with construction costs to be recovered over time through toll revenues. The bridge is named after Gordie Howe, a Canadian hockey legend who played most of his career with the Detroit Red Wings.

Michigan Governor Gretchen Whitmer’s office pushed back on Trump’s claims, noting that the bridge was paid for by Canada, built by union workers from both countries, and will operate under a joint Canada-Michigan governance agreement. The governor’s press secretary described the project as a model of bipartisan and cross-border cooperation and said it would open as planned.

The bridge has previously drawn political attention in Washington. During Trump’s first term, the US owners of the nearby Ambassador Bridge lobbied the administration to revoke a waiver granted in 2012 that allowed the project to use non-US steel, citing the fact that Canada was covering construction costs.

Canadian officials and the bridge authority did not immediately respond to requests for comment. Candace Laing, chief executive of the Canadian Chamber of Commerce, pointed to a 2017 joint statement by Trump and then-Prime Minister Justin Trudeau that described the bridge as a “vital economic link” between the two countries.

Trump’s remarks come amid renewed tensions with Canada, the largest buyer of US exports. In recent weeks, he has threatened steep tariffs on Canadian goods and aircraft, though none of those measures have yet been implemented.