Republicans in the Iowa House advanced a stringent 20-week abortion ban and 72-hour waiting period Wednesday, marking a victory for Iowa conservatives who have long-sought to restrict the practice. The chamber voted 55-41 for the legislation, which provides no exception for rape, incest or fatal fetal anomalies. The bill must return to the Iowa Senate for final approval, after the House amended it to require that a woman wait 72 hours before getting an abortion.