Various news outlets are reporting that, at midnight tonight, special U.S. tariffs on imports of steel and aluminum from Canada, Mexico, and the European Union will go into effect. This action stems (incongruously and capriciously) from two nearly yearlong investigations conducted by the U.S. Department of Commerce under Section 232 of the Trade Expansion Act of 1962, which found that imports of steel and aluminum “threaten to impair the national security” of the United States. This seldom used statute gives the president broad discretion both to define what constitutes a national security threat and to prescribe a course to mitigate the threat. On both counts, President Trump has abused that discretion.

In March, the president announced his intention to impose duties of 25 percent on steel imports and 10 percent on aluminum imports from all countries. But temporary exemptions were granted to some countries in an effort to extort commitments from them to do their part to reduce the U.S. trade deficit (by selling us less stuff and buying from us more stuff) or to agree to U.S. demands in ongoing trade negotiations (South Korea, Canada, Mexico). The Koreans succeeded by agreeing to limits on their steel exports and by upping the percentage of US-made automobiles that can be sold in Korea without meeting all of the local environmental standards. Ah, free trade…

Apparently, the Europeans, Canadians, and Mexicans haven’t bent sufficiently to Trump’s will, therefore those countries—those steadfast allies—constitute threats to U.S. national security and will no longer be exempt from the tariffs, which means that U.S. industries that rely on steel and aluminum (imported or domestic) will be hit with substantial taxes to mitigate that threat. Got it?

This announcement comes on the heels of one made earlier this week regarding the “trade war” with China, which is back on 10 days after Treasury Secretary Steve Mnuchin declared it to be “put on hold.” (I guess it was just a rain delay.) On June 15, the administration will publish the final list of Chinese products—about 1,300 products valued at about $50 billion—that will be hit with 25 percent duties. The Chinese government has published its own list of U.S. exports that will be hit with retaliatory duties in China.

So, as has been the case every day for the past 16+ months, the U.S. and global economies (even as they’ve strengthened) remain exposed to the whims of an unorthodox president who precariously steers policy from one extreme to the other, keeping us in a perpetual state of uncertainty. With the Europeans, Canadians, Mexicans, and Chinese all preparing to retaliate in response to these precipitous U.S. actions, at the stroke of midnight we may finally get the certainty of the beginning of a deleterious trade war.