President Trump has threatened to impose 5% tariffs on all goods from Mexico on June 10 if Mexico does not take action to slow the number of immigrants at the border. As I am writing, he has vowed to continue to escalate the levies to 25%, Mexico has threatened to retaliate, and Congress has announced that it will stop them with enough votes to override a veto. Who knows what the status will be when you are reading this? Even if the situation is resolved, the threat of such action increases uncertainty and makes it more difficult to finalize a replacement for the North American Free Trade Agreement. If the tariffs actually go into effect and are maintained, it would cost hundreds of thousands of US jobs.