With Monday night’s announcement that he’s nominating D.C. Circuit Court Judge Brett Kavanaugh to fill the seat vacated by Anthony M. Kennedy, President Trump moves one step closer to shifting the direction of the Supreme Court for a generation or more. As the swing vote in closely divided cases, Kennedy single-handedly decided some of the most controversial issues in the United States. Trump’s decision to tap Kavanaugh leaves Republicans hopeful that more of those cases will be decided in their favor.