US is the largest food exporter in the world. It would make sense to start with no longer subsidising exports, and putting more subsidies into food that is actually consumed in the country. This would kill the export part of the industry (whose main beneficiaries are rich people owning large farms), while increasing wages of farm workers.

Also, the US's Midwest has one of the best lands in the world for farming, there's zero need to farm in the deserts from the country's (not the rich farm owners') perspective.