Does a government employee have a constitutionally protected property interest in continued employment?

A government employee has a constitutionally protected property interest in continued employment when the employee has a legitimate claim of entitlement to the job. Board of Regents v. Roth, 408 U.S. 564, 577, 92 S.Ct. 2701, 2708, 33 L.Ed.2d 548 (1972). Laws, rules or understandings derived from independent sources such as state law create such claims of entitlement. Id. However, a mere expectation that employment will continue does not create a property interest. Id. If under state law, employment is at-will, then the claimant has no property interest in the job. Id.