Insurers face uncertainty in setting 2018 rates due to the possibility that the AHCA could pass, creating a smaller risk pool. This may lead insurers to submit higher initial rates to avoid further increases, put upward pressure on final approved rates, or cause some insurers to withdraw entirely from certain state markets. Congressional leaders could help stabilize markets by definitively ruling out ACA repeal legislation before insurers must finalize 2018 rates in late summer or early fall. Repealing the ACA without a replacement would significantly increase the uninsured population and cause premiums in the nongroup market to double by 2026 according to CBO estimates.