NAB facing massive fine as ASIC launches "fees for no service" court action. I speak with ASIC deputy chairman Dan Crennan who says "it's possible" that former NAB chief executive Andrew Thorburn could be called as a witness

National Australia Bank is facing a theoretical fine that could run into the billions of dollars as the "fees for no service" scandal heads to court. 

The Australian Securities & Investments Commission says NAB allegedly breached conditions of its financial services licence and failed to act honestly and fairly. 

ASIC deputy chairman Dan Crennan tells ABC's Peter Ryan it is possible that former NAB chief executive Andrew Thorburn could be called as a witness.