I'm afraid that you have no legal claim here. Unless you have an employment/union agreement or this is some way violates company policy or is a result of discrimination, your employer can do this.Such an action does  not violate the law. The reason is that most states employment relationships are "at will".  What this means is that an employer can hire or fire someone for any reason or no reason at all, as well has increase/decrease salary/hours, promote/demote, and generally impose requirements as they see fit.  In turn, an employee can choose to continue to work for an employer or not.