The United States Supreme Court has held that in order for a county constable to terminate an employee for making a political remark on a matter of public concern, it must be shown that the constable's interest in terminating the employee outweighs the employee's first amendment rights.
Rankin v. McPherson, 107 S. Ct. 2891 (1987).
Constitutional Safeguard on Speech - Dismissal of Public Employee - Balancing Approach,
Duq. L. Rev.
Available at: https://dsc.duq.edu/dlr/vol27/iss1/9