Controversial anti-Islam activist and former Dutch politician Ayaan Hirsi Ali says authorities need to more effectively "assimilate" Muslim migrants in Australia and prevent Islamists and would-be extremists from arriving.

Speaking days after she cancelled a visit to Brisbane, Melbourne and Sydney citing security threats, Ms Hirsi Ali said she was unfazed by planned large protests, but poor security planning had made the trip impossible.

In a friendly interview with conservative Sydney radio host Alan Jones on Wednesday, the atheist author said the government needed to intervene to prevent extremists preying on young men in religious schools and promoting their attitude of hostility towards Australian society.

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