An ancient proverb warns that a double-edged sword wounds not only its intended target but also the one who wields it. Critics and constitutional scholars increasingly invoke that metaphor to describe what they view as the evolving relationship between the Supreme Court and the Republican-controlled Congress. They argue that, by gradually conceding portions of their constitutional authority to the executive branch, both institutions have helped create what some describe as an “Imperial Presidency”—one possessing powers that now threaten not only America’s constitutional democracy but also the very institutions that helped create it.