discrimination in the workplace?

[longemoco]

Today my wife went and applied at a store and then she had and interview, and the manager told her this," you are not a citizen, are you? and my wife said yes but the guy didnt believe her and started asking more questions,
so now if she wants to get the job she has to go tomorrow and bring her birth certificate and social security card and id, she wants to go ahead and do it but i feel like the guy is discriminating her because we got married and now she has my last name, but she is a citizen, born in fresno,ca.

anybody here knows a number i can call to report the guy? or what should i do? I just didnt like how just because he sees mexican last name he automatically thinks "ILLEGAL HERE".