(3) In the matters reserved to the law by the Constitution, the Grand Duke can only make regulations and orders by virtue of a particular legal provision which establishes the objective of the measures of execution and[,] the case arising[,] the conditions under which they are submitted.
(4) In case of international crisis, or of real threats to the vital interests of all or part of the population or of imminent danger resulting from grave infringement of public security, the Grand Duke, after having declared urgency resulting from the impossibility of the Chamber of Deputies to legislate in the appropriate time periods, may take regulatory measures in all matters.
These measures may derogate from existing laws. They must be necessary, appropriate and proportionate to the goal pursued and be in conformity with the Constitution and with the international treaties.
The prolongation of the state of crisis beyond ten days may only be decided by one or several laws voted under the conditions of Article 114, paragraph 2 of the Constitution, which establishes the duration [and] without which the prorogation must not exceed a maximum duration of three months.
... (Art. 32)