Roe v. Wade, a landmark Supreme Court case that led to the creation of a constitutional right to an abortion, is without basis in the Constitution and must be overruled, conservative Associate Justice Clarence Thomas argued.

Thomas, nominated by former President George H.W. Bush, issued a scathing rebuke on Monday of the Supreme Court’s decision in June Medical Services v. Russo to strike down a Louisiana law pertaining to abortion. Within his 20-page dissent, Thomas categorized the right to an abortion as an erroneous precedent grounded in a “legal fiction” of substantive due process.