Veto power: Veto power refers to when an individual (such as the President) rejects or refuses to approve legislation passed by Congress.
Nullification: Nullification is an action taken by states where they declare certain federal laws invalid within their borders.
Judicial review: Judicial review is when courts have authority to examine laws or actions made by other branches (such as Congress or the President) for constitutionality. If found unconstitutional, they can refuse enforcement through legal rulings.