Free Constitutional Party questions legitimacy of the president under new constitution

The head of the Tunisian Free Constitutional Party Abeer Moussa announced she had sent a letter, documented by a notary, to the president. She claims his authority became illegitimate after he issued the new constitution, since he took the constitutional oath on an abolished constitution, and there is no legal way for him to swear an oath on the news constitution in the absence of Chamber of Deputies and constitutional court. Moussa in the letter demanded President Kais Saied to declare vacancy of the position of president, and declare himself as acting president, as well as call for early presidential and legislative elections.