Greens senators walked out of Pauline Hanson's incendiary first speech to the Senate, after she claimed the nation was "in danger of being swamped by Muslims" with its people "living under sharia law and treated as second-class citizens" if urgent changes weren't made to immigration policies.

The Queensland senator made her views on Islam and those who practise it clear just a few minutes into her first Senate speech since her re-election, claiming they "bear a culture and ideology which is incompatible with our own" and calling for an end to all immigration.

Migrants already within the borders, who did not "assimilate" into what Senator Hanson described as Australia's culture, could "go back where you came from … if it would be of any help, I'll take you to the airport and wave you goodbye with sincere best wishes".

But the senator, who also called for an end to halal certification and for a ban on the construction of any further mosques - with those existing to be monitored - said she did not believe the nation could remain secure under current policies.