Women who wish to terminate a pregnancy, and physicians willing to perform abortions, are subject to increasing harassment from groups which challenge the constitutional abortion right upheld by the Supreme Court in Roe v. Wade. Their vulnerability, in fact, parallels the vulnerability of the aboriton right. This Article analyzes the inherent weakness and impending obsolescence of the trimester framework established in Roe. Present medical evidence of maternal health risks and fetal viability demonstrates that the trimester framework is inconsistent with current medical knowledge, and will likely be rendered obsolete by developments in medical technology. The Article suggests that adoption of an alternative constitutional basis for legal abortion is necessary to preserve the abortion right, and explores the utility of two arguments grounded in the equal protection doctrine. Finally, it discusses means of preserving legal abortion within the confines of the trimester framework established in Roe v. Wade.