Within hours Prime Minister Trudeau announced that we would be adding duties to imported American paper products, among many other things. Likewise, Mexico has promised targeted tariffs, hoping to inflict retaliatory pain on those states which are considered the most politically important to the President.

These efforts, like the diplomatic strategies before now, will not work. If Trump revokes the tariffs, or begins to support NATO, or returns to the Paris Accord, it will not be because our diplomats became more persuasive, our offers more generous, or our tariffs more painful. That is not how this President operates.

As I’ve pointed out before, the President can be successfully engaged, and countries like Ukraine, China, and Qatar have demonstrated this. When they want something from the United States, they skip the State Department, and even the White House staff. Instead of approaching their problem state-to-state, they go state-to-man. These countries focus on what Trump wants on a personal level — to enrich his family. So Beijing granted Ivanka trademarks, Qatar invested in one of Jared’s office towers, and Ukraine, with Slavic candor, simply wired half a million dollars to the President’s personal lawyer Michael Cohen.

For the most part, the western allies understand that if we want the U.S. to do something we must negotiate with the man himself. What we have not grasped yet is, as strange as it sounds, the President of the United States is more concerned about promoting his interests than defending America’s.

I propose that instead of taxing the import of American serviettes, we tax Trump. In the spirit of the Magnitsky Act, Canada and the western allies come together to collectively pressure the only pain point that matters to this President: his family and their assets. This could take the form of special taxation on their current operations, freezing of assets, or even sanctions against senior staff. Canada could add a tax to Trump properties equal to any tariff unilaterally imposed by Washington. The European Union could revoke any travel visas for senior staff in the Trump organization. And the United Kingdom could temporarily close his golf course.