The principle of checks and balances empowers the judiciary to

The principle of checks and balances in government ensures that no single arm of government becomes too powerful by providing a system of shared powers among the three arms of government. The judiciary is empowered to interpret the law and ensure that the other two arms of government, the legislative and executive branches, abide by the law. Specifically, the judiciary can invalidate the actions of the other arms of government if they are found to be unconstitutional, which helps to prevent abuse of power and maintain the rule of law. Therefore, the answer is "invalidate the actions of the other arms".