It's looking like the Affordable Care Act insurer subsidies aren't going to be funded through the upcoming spending bill. This means that until a pending court case on their legality is resolved, the Trump administration is going to have to decide whether to keep paying them. Here's where people would be impacted the most if the administration stops paying the subsidies.

Data: Centers for Medicare & Medicaid Services; Map: Lazaro Gamio / Axios

How it works: The subsidies are paid directly to insurers, but then insurers by law must pass them on to low-income enrollees by reducing their deductibles and out-of-pocket spending.

What could happen: If the subsidies aren't funded, insurers will likely either pull out of marketplaces altogether or significantly raise premiums.

To note: Most states with the highest percentage of enrollees receiving subsidies are traditionally red states, and many are in the south.