Tunisia: risk of 'presidential vacancy' if detained Nabil Karoui is elected (expert) According to Chafik Sarsar, professor of public law and former head of electoral commission (ISIE), if detained media mogul Nabil Karoui is elected president but is not able to take an oath, there could be a 'presidential vacancy' and a new election, which has never been seen before in Tunisia. ISIE has confirmed that the October presidential runoff vote will pit Karoui against law professor Kais Saied. IMAGES AND SOUNDBITES