A constitutional government by definition is a

Constitutionalism fundamentally means a limited government. It embodies the principle that governmental authority is derived from and restricted by a body of fundamental law.

It stands in contrast to arbitrary power and despotism.

Key elements of constitutionalism include:

• Government according to a constitution.
• Separation of powers.
• Sovereignty of the people and democratic government.
• Constitutional review.
• Independent judiciary.
• A bill of individual rights that limits the government.
• Controlling the police and ensuring civilian control of the military.

A government exceeding its constitutional limits forfeits its legitimacy.

Therefore, a constitutional government is, by definition, a limited government.