Tunisia’s 2014 proportional representation with rule of highest remainder formula, imagined as a guard rail against a return to presidential authoritarianism, has proven to be highly problematic. In theory, the equation is simple. The parliament, the country’s supreme power, is directly elected by the people and all winning political formations are represented within the legislative body. The executive branch is bicephalous, shared between a Head of Government and a Head of State. The latter theoretically only holds “residual” prerogatives, mainly related to defense and diplomacy. Yet, the reality of Tunisian politics since 2014 has proven different.