When you partially treat tuberculosis (TB), the bacteria that survive “learn”. You killed off the easy ones, and the ones that are left are bacteria that have genetic changes that make them drug resistant.
The US just shut down a program that supplies tuberculosis treatment around the globe. People in the middle of treatment for dangerous strains are being left without complete treatment.
This will kill people, and may make more drug-resistant TB. This is bad for the US, and world.