We don't have the Borg policy operating in Australia.
Anyway, regardless of the attempts to justify Hanson's stance, it does not change the fact that Hanson is a racist and a bigot.
As for who we let in, I'm all for tougher immigration, include a strict code of conduct and a probationary period, with swift and decisive penalties for breaches. No need to be a racist or bigot to toughen up on immigration.