I would limit the scope to discrimination against white males
You are correct. This will be shot down easily by universities if Trump proceeds on general white college students when white females are the largest group of affirmative action enrollees (according to the Chronicle of Higher Education - they would know).
The students who are really affected are white Christian males and Asian males. Parents of these kids send millions of dollars in application fees to elite schools that have no intention of admitting any of them on merit. It’s a a scam.