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Why do U.S. federal courts not give advisory opinions to the president or Congress?

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A person ascends the steps of the west facade of the United States Supreme Court Building in Washington, D.C., with its tall columns and a round fountain in the foreground. — Supreme Court of the United States The west facade of the U.S. Supreme Court building, Washington, D.C.

U.S. federal courts do not issue advisory opinions because the U.S. Constitution limits the judicial power of the federal courts to actual "cases and controversies".12

This requirement ensures that courts only decide constitutional questions when they are rooted in a genuine dispute where the parties involved have a direct, personal interest in the outcome. By restricting the judiciary to resolving concrete conflicts, the system upholds the separation of powers, ensuring that judges do not act as legal advisors to the executive or legislative branches.134

Unlike some state courts or foreign legal systems that may allow for abstract or declaratory opinions, U.S. federal courts maintain their role as impartial arbiters by refusing to adjudicate issues that do not arise from a specific, adversarial proceeding.315