JNS.org–Turkey is believed to be the largest source of foreign fighters for ISIS. The New York Times reports more than 1,000 Turks are suspected to be fighting for the terror group, many of them disaffected youths attracted to the jihadist group by its ideology and the money it pays its fighters–up to $150 a day. A recent CIA estimate said that Islamic State has 20,000-31,500 fighters in Iraq and Syria. The U.S. has pressed Turkey to take a more active role in combating ISIS by stopping the flow of foreign fighters who use Turkey as an entry point and by preventing Islamic State from using Turkish black markets to export its oil, a key revenue source for the terror group. But Turkish President Recep Tayyip Erdogan has resisted the calls to crack down, citing the fate of 49 Turks the terror group is currently holding hostage.