The head of Australia's top spy agency has rebuffed One Nation leader Pauline Hanson over her fears that refugees were contributing to terrorism.

Despite the growing threat of Islamist extremism, Australian Security Intelligence Organisation boss Duncan Lewis indicated there was no evidence to substantiate several of the minor party leader's claims.

Senator Hanson asked the ASIO director-general whether he believed the terrorist threat was "being brought in" courtesy of Middle Eastern refugees.

"I have absolutely no evidence to suggest there's a connection between refugees and terrorism," Mr Lewis replied.

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