At a midterm convention rally, President Trump promised every American adult a $5,000 dividend check contingent on Republicans retaining Congress — a pledge that collides almost immediately with constitutional law, fiscal arithmetic, and the uncertain political landscape of an approaching election. The power of the purse has resided with Congress since the republic's founding, and no existing appropriation, no tariff windfall, and no precedent from Trump's own prior promises brings this vision measurably closer to reality. It is a moment that invites reflection on how political promises functi