The chief justice’s opinion hinged on a legal principle called the “major questions doctrine” — the same doctrine that was used repeatedly to block the Biden administration’s regulations and orders.

The court’s rejection of President Trump’s tariffs program is the latest in a series of clashes between him and Chief Justice John G. Roberts Jr.

Empirical SCOTUS is a recurring series by Adam Feldman that looks at Supreme Court data, primarily in the form of opinions and oral arguments, to provide insights into the justices’ decision making ...