In this paper, we discuss the textual, structural, and historical roots of judicial review. First, we show that the constitutional text permits judicial review and we describe the severe difficulties associated with the claim that the Constitution is not law to be applied in the courts. Second, we explain that the constitutional structure requires the judiciary refuse to enforce laws that violate the Constitution due to its status as a coordinate branch of government. Simply put, the text and structure demand that the judiciary interpret and give effect to the Constitution in the course of performing its function of deciding Article III cases or controversies. Third, we refute the notion that the Founders did not understand the Constitution to establish judicial review. We trace how historical developments leading up to the ratification had made judicial review a familiar institution to the Founders, and we demonstrate that all those who discussed judicial review during ratification (there were dozens) agreed that the Constitution authorized judicial review. We conclude that those who argue that the Founders originally understood the Constitution to preclude judicial review have misread the historical record.