It's a difficult discussion to have because any mention of any sort of possible negative impact of migration is met with shouts of racism from the liberal left.
Working on increasing vaccination rates is certainly a lot more reasonable.
I'd be more worried about states like Missouri and Indiana with nearly a sixth of the population who are not vaccinated against measles. Mexico, as a counter example, has a nearly 99% vaccination rate for measles.
So please stop with this nationalistic nonsense.