AFAIK the idea of immigrants impact being a net negative isn't supported by the studies I have read.
I understand this isn't necessarily in line with the rhetoric du jour.
Immigrants as a whole being a net positive might be clear, but the demographics most commonly under debate are things like "refugees" or "illegal immigrants" or "people seeking asylum at the US-Mexico border". Now, it's possible that those groups are still a (financial) net positive, but I'd be a lot less confident in that than "doctors" or "people with a degree".
This also doesn't really address the issue of "what impact does immigration have on US wage earners". An immigrant doctor or programmer might be clearly beneficial financially and to the country as a whole, but the doctors and programmers they're competing with might not be quite so happy. And while those demographics can "take it" so to speak, unskilled laborers facing the same competition are in a bit tougher of a spot.