They're not going to stop it, just seriously disincentivize it. Pulling billions of dollars of research funding and making it doubtful whether any developed vaccine can be sold in the USA will have a huge effect on the ability of academic institutions to do research and the willingness of corporations to do so.
Ah yes, I misunderstood, sorry. I'll leave my other comment because it's still a serious concern, and there will be people who think all research should be privately funded.