Tony Abbott has pledged to tighten up visa and citizenship processes after the release of a far-reaching report into the Sydney cafe siege.
The prime minister will on Monday make a national security statement to parliament to put forward a case for tougher counter terrorism measures, saying for too long Australia has given the benefit of the doubt to would-be extremists.
He has already threatened to tighten welfare restrictions, crackdown on Islamic hate preachers and ban Islamist group Hizb ut-Tahrir.
But releasing the joint federal-NSW report into December's Sydney cafe siege on Sunday, he said measures were needed to make sure extremists didn't "slip through our visa and citizenship net".
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The report exonerated various government authorities for failing to detect the threat posed by siege gunman Man Haron Monis but recommends major changes to the system that let him into the country.
It called for improved verification of supporting documents and information provided by visa applicants, and better assessment of the risks posed by individuals seeking citizenship.
Policy and legislative changes should be made to support decisions to grant or revoke visas and citizenship, the report said.
Mr Abbott said "this monster", Monis, shouldn't have been allowed into the country.
"We obviously do need more checks and more scrutiny in the visa process, in the citizenship process," he told reporters in Sydney.
"We do need to renew and redouble our efforts in countering violent extremism and I'll have a lot about more to say on those subjects tomorrow as part of my national security statement."
Australia needed a higher level of scrutiny and heavier sanctions for people who "game the system" when it comes to visa applications and citizenship applications, he said.
Australia also needed ask itself if it needed to change the "tipping point" from protection of the individual to safety of the community.
"The question of precisely where we draw the line in the era of terrorism will have to be reconsidered and the line may have to be redrawn," he said.
Mr Abbott on Saturday foreshadowed a crackdown on abuse of welfare by terror supporters.
He said 55 of 57 Australians who had by November travelled to the Middle East to join Islamic State had been on welfare.
"If you are fit enough to go overseas to fight for a terrorist organisation, surely you should not be abusing the welfare system back in Australia," he said.
The prime minister has also pledged to take on individuals groups that justify terrorism, such as the notorious Hizb ut-Tahrir.
The group is banned in many Middle East countries and also in Russia, Turkey, Pakistan and Germany but not in Australia, the US or UK.
