What does Aristotle believe is the essential theme or "heart of modern constitutional governments" (including the United States)

Aristotle promoted reason as the guiding force of learning. He proposes that even the rulers must be subject to the law. This main principle lies at the heart of modern constitutional governments. ... except by the lawful judgement of his equals or by the law of the land.

Yes i believe he was involved, but the main culprit was bill clinton