Discrimination by defintion means treating a person on the basis of a prejudice (discriminatory employment practice laws protect groups based on race, age, national origin, gender etc..). Here, the employer wants to fill the spot with a long-term answer and is looking for an employee that best fits that description. This does not sound like discrimination.
You might read my Legal Guide "Can An Attorney Really Help?"
You might find my Legal Guide helpful " What Do I Tell My Lawyer?"
Check with a lawyer in your locale to discuss more of the details.
Good luck to you.
NOTE: This observation is made available by the out-of-state lawyer for educational purposes only and is not like communication with a lawyer with whom you have an attorney client relationship along with all the privileges that relationship provides