Thats certainly in the realm of possibility but the evidence of that needs to be clear. Accusations like that are one step removed from complete paranoia.
Well the evidence would have to be clear to deport a single person. But a general trend could be enough justification to shut down immigration from certain countries. That is not a personal punishment like a deportation, so it does not need conclusive proof (which of course doesn’t exist, there is no country which sends exclusively or predominantly bad immigrants to the US).