One more time, they get cash, weapons, and volunteers from all over, wherever they find it. ISIS itself began as the anti-US “resistance”, indigenous to Iraq; Syria’s Assad helped them out, and Iran probably did as well, so if you’re looking for state sponsors for some reason, there you go.
Our Senate Intel Committee members and staff certainly knew much more then anyone ever told us, the public. Here is the Senate Intel Committee Report if anyone wants to read it.
http://www.intelligence.senate.gov/benghazi2014/benghazi.pdf