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How many Supreme Court justices must agree to hear a case under the Rule of Four?

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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.

Under the Rule of Four, at least four of the nine justices of the Supreme Court of the United States must agree to grant a writ of certiorari to hear a case.12