As thought of by me.
The beauty of it, if I do write so myself, it that it’s wholly independent of tariffs, whether foreign policy or protectionist.
The idea, at a level of generality, is this. Congress, the President, and his Cabinet Secretaries develop a list of all goods and services critical to our national defense. The list must necessarily include dual use goods and services, those items that can serve both the private economy and our defense systems.
Then Congress and the President draw a hard line and require that 15% (to pull a number from the æther) of everything needed for production of those critical goods and services, from ore through intermediate components to the last components needed for final assembly or service provision, be produced entirely domestically. This would serve two purposes. One is that it would relieve our dependence on other nations, particularly enemy nations, for any of those goods or services, the denial of any one of which would stop our economy and our ability to defend ourselves beyond stocks already in place—a few weeks to a couple of months worth in an active shooting conflict.
The other purpose is that it would give us an extant production core from which we could surge production and expand production facilities much more quickly than if we had to attempt to start from scratch just to begin to surge.
The last step is to require a review of the list of goods and services every five years, de novo, adding to/removing from the list as necessary to keep it current. Every five years to relieve the review cycle, at least a little bit, from political cycles while keeping the update rapid enough to keep up with evolving technologies.
Of course, this will cost more than a classical Ricardian free trade, Smithian free market environment, but that’s the cost of national security. If we can’t protect a capacity for self defense, we’ll pay a far higher price.