KAIROUAN, Tunisia (Tribune News Service) ? When the leaders of the Islamic State declared their caliphate in Iraq and Syria, no nationality from outside those countries heeded the call to come fight for it like the Tunisians did. Now, weeks after the caliphate's defeat, Tunisia is confronting that legacy. Thousands of Tunisian fighters and their family members are believed held in Syria and Iraq, as well as in Libya. Their status represents part of the unfinished business of the U.S.-led war against the Islamic State and a daunting challenge for this small North African country. As their relatives try to bring them back to Tunisia, government authorities here are resistant, fearing that even...