Gen Flynn tends to think GWB had a huge hand in formation of ISIS. Of course Jeb Bus,h when confronted on this subject, will place the blame on Obama.
Sauce
https:// www.newyorker.com/news/news-desk/did-george-w-bush-create-isis
https:// www.usnews.com/news/articles/2015/12/01/former-military-official-says-george-w-bush-created-isis