Often celebrated as the Arab Spring’s so-called success model, Tunisia is facing its biggest political crisis since the 2011 revolution that introduced democracy. On Sunday, President Kais Saied removed Prime Minister Hichem Mechichi, who was also in charge of the interior ministry, and suspended Parliament. Parliament speaker Rached Ghannouchi, who heads Parliament’s biggest party, Ennahdha, accused Saied of launching “a …