Constitutional Courts and representative democracy

In the representative democracy Parliament should play a role of delegated power (using the paradigm of liberal democracy). However, in certain circumstances Parliament tends to overstep its competences. To prevent such a situation independent and impartial arbiter is needed. Constitutional court plays usually such a role. The court should be a kind of constraint on political brunch of government. If constitutional court is captured it fails to act as neutral arbiter. The court becomes a servant of political will – a kind of addendum to unconstrained Parliament. From systemic point of view constitutional court become a safeguard of ill-functioning system (eg illiberal democracy).