In 2003, Congress passed the Partial-Birth Abortion Ban Act, which led to a lawsuit in the case of "Gonzales v. Carhart". The Court had previously ruled in "Stenberg v. Carhart" that a state's ban on partial birth abortion was unconstitutional because such a ban did not have an exception in the case of a threat to the health of the mother. The membership of the Court changed after "Stenberg", with Roberts and Alito replacing Rehnquist (a dissenter in "Roe") and O'Connor (a supporter of "Roe") respectively. Further, the ban at issue in "Gonzales v. Carhart" was a federal statute, rather than a state statute as in the "Stenberg" case.