The Constitutional Law has among its duties to deal with political and juridical crisis. That's the reason why it provides some mechanisms such as impeachment, martial law, etc. The logic is that in periods where the law is challenged, some exceptional tools are required. However, the rhetoric of crisis is increasingly, and brings the defense of ad hoc solutions. The Brazilian use of the impeachment's procedure gives the idea that weakening the applicable law is necessary to deal with a difficult situation. But the crisis, which could be of economical, social, political or juridical nature, emerges as the new order, implying that the maintenance of this rhetoric, causes the constitutional law to lose all its force and applicability. This work aims to discuss the use of the crisis rhetoric in the Brazilian case and its fragility.