It’s a decision, that could shape America for decades. After 30 years of service, Supreme Court Justice Anthony Kennedy has decided to retire. While Justice Kennedy was largely known as a conservative-leaning judge, he was the swing vote on a number of landmark cases, favoring more liberal ideals. These included Planned Parenthood v. Casey, which affirmed the constitutionality of Roe v. Wade, and women’s right to an abortion. Roper v. Simmons, which deemed the death penalty to people under 18, unconstitutional. And Boumediene v. Bush, which allowed those detained at Guantanamo Bay to petition their imprisonment. Kennedy was also the swing vote in the landmark case regarding gay rights in Obergefell v. Hodges in 2015. That case granted same-sex couples the right to marriage, in all 50 states. With Justice Kennedy leaving the bench, President Donald Trump may now appoint a justice favorable to his policies, at a time in which many of Trump’s policies are now being debated in high-level courts. The appointment of another conservative justice, following Neil Gorsuch last year, could tip the scales in a major way, calling into question Supreme Court decisions that have long been considered concrete. So who will Trump appoint? And how will they leave their mark on the Supreme Court and President Trump’s legacy?