I think he might seriously unleash the biggest man made famine of history, and it's the Americans who will be starving. At some point, it is going to be so expensive to grow crops in the US that farmers will have no choice but to let their crop die in their fields.
Add in that their poultry industry is struggling and borderline decimated by bird flu.
Get vaccinated if you need to and vaccinate your kids. Measles is not a joke, it spreads much faster than COVID and it destroys your immune system.