evidence: New research by the Guttmacher Institute, a nonprofit research organization that supports abortion rights, suggests the long-term decline may be reversing, with an increase in 2020. [...] Third-trimester abortions are rare and heavily restricted. Just 1 percent of abortions take place after 21 weeks; the third trimester begins around the 28th week. [...] Third-trimester abortions are performed in only a handful of clinics and hospitals in the United States, according to the American College of Obstetricians and Gynecologists. Methods for third-trimester abortions vary based on the circumstances. They usually involve a combination of medication and surgical procedure and can take several days.