The bigger issue behind funding is policy in the ME.
 
US policy has been to create chaos by violently overthrowing religious tolerant secular governments - Iraq, Libya, and Syria and promote destabilizing religious sectarian conflicts in partnership with authoritarian regimes of Saudi Arabia, Gulf States, Egypt, and Zionist Israel.

Iran is in the cross hairs of this policy because of it's strength to counter US hegemony. Afghanistan is insanity in search of a policy.

Until policy changes, there will always be means to covertly fund ME conflict and chaos, which feeds the US arms industry, the largest export the US relies on.