IANAL, but unfortunately there is probably not much you can do in this case. Many states are right to work states meaning that the employer can terminate your employment without reason as long as it is not discriminatory based on age, sex, race, etc... I am also going to assume that this was a temp position that was fulfilled through Kelly services in which case the employer has even more leeway presumably in their contract with Kelly. There is probably a clause in there somewhere that says that since it is a "temp" fulfillment they can terminate their relationship with you at any time without cause.