Your approaching it from the wrong angle. You need to narrow it down that a better qualified candidate was passed on for being white. The resume/recruiter stage

Your approaching it from the wrong angle. You need to narrow it down that a better qualified candidate was passed on for being white. The resume/recruiter stage would be the easiest as you have comparable data. But if it’s at the final stage and both candidates are equally qualified, a cultural fit, and can be taken either or, then it wouldn’t matter since it would be up to the hiring managers preference either way.