Immigration Minister Peter Dutton has come to the aid of Australian Security Intelligence Organisation head Duncan Lewis over his controversial statement that there was "no evidence" of a link between refugees and terrorism.

Mr Dutton would not explicitly agree with Mr Lewis' remarks, but urged critics to cut the spy agency boss some slack after nearly a week of heavy criticism from the likes of Pauline Hanson, Tony Abbott, Andrew Bolt and others.

"The point Mr Lewis was making, that others have made, and I've made on a number of occasions, is that we do have problems where people are indoctrinated online, where they have an impressionable young mind," Mr Dutton said on Thursday. "They can be of any background, they can come to this country on any visa.