Contracts Clause Claim Vertragsklauselanspruch Contracts Clause Claim Reclamación de Cláusula de Contratos Reclamación de Cláusula de Contratos Réclamation de clause contractuelle תביעת סעיף חוזים अनुबंध धारा दावा 契約条項請求 Reivindicação de cláusula contratual 合同条款索赔 A Contracts Clause claim is a legal argument asserting that the law or action impairs the obligations of existing contracts, either by retroactively changing the terms or by unduly burdening the parties' ability to enforce or perform their contractual rights and obligations. The Contracts Clause prohibits the impairment of contractual rights by the government without a legitimate and substantial public purpose.