I wonder if this has to do with the current economy and job market. Anecdotally I have found it very tough to find a new job (software engineering), though my previous employer continues to post job listings for green card applications as part of the required labor market test.
I'd say it's on the Trump administration being full of racists and white nationalists and wanting to deport immigrants. Why do you wonder if it's economic instead of the Trump administration's announced policies of stopping immigration, including unconstitutionally removing birthright citizenship?
The first because a lower supply of labor is going to create breathing space for an entire working population who will see tremendous job upheaval due to AI automation. A lower aggregate demand on houses, services will also be welcome to take the fuel out of inflation, and maybe we'll regain some of that experience of true affluence, where scarce things (e.g. access to cabin in the woods, a rowhome in a walkable city, ...) are in abundance. There is also the import of an idle, criminal element that has very clearly reduced quality of life and safety in many places.
Birthright citizen should be abolished because birth tourism and illegally crossing the border to have anchor babies are a vector for foreigners to participate politically and claim imho undeserved welfare benefits.
I think largely these are the stated reasons of the administration too.