Kant’s description of the moral politician in ‘Perpetual Peace’ is the most detailed statement of his template for legislative reform. I argue that the moral politician responds to criticisms of Kant’s earlier ‘Theory and Practice’ essay by Friedrich Gentz and August Wilhelm Rehberg. Gentz and Rehberg objected to: Kant’s treatment of the relationship between theory and practice in politics, his conception of popular sovereignty, and his account of political transformation. By showing that Kant used the moral politician to rebut Gentz and Rehberg, I highlight an underappreciated dimension of ‘Perpetual Peace’ while situating Kant’s political stance in its historical context.