What happened when the Pennsylvania legislature last took up a 20-week ban: A bill that would ban abortions at 20 weeks except in medical emergencies passed the state House in June. The law also would have curtailed the procedure known as dilation and evacuation, used in second-trimester abortions. Then, in July, the Senate Judiciary Committee approved the bill. The full Senate, however, did not vote on the bill before the end of legislative session.