Australia's domestic spy chief has been forced to expand on comments he made rejecting a link between refugees and terrorism, after days of intense pressure.

Last week, Duncan Lewis, the director-general of the Australian Security Intelligence Organisation, told a Senate hearing there was "absolutely no evidence" of a connection, rebuffing questions from One Nation leader Pauline Hanson.

In a rare media appearance on Wednesday morning, Mr Lewis said the key point was that "the refugee program is not the source of terrorism in Australia".

"We have had tens of thousands of refugees come to Australia over the last decade or so and a very few of them have become subjects of interest for ASIO and have been involved in terrorist planning," he told ABC radio.

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