Greens senators Scott Ludlam and Larissa Waters, and now Liberal-National Party Senator Matt "the Accidental Italian" Canavan, have all recently fallen foul of section 44(i) of the Australian constitution, with the two Greens resigning immediately, and Canavan resigning his ministry but vowing to fight in the High Court to keep his Senate seat.

Various pundits have weighed in on this arcane section of our constitution, with some saying it is complicated, and others that it is badly in need of reform. So how do Australia's provisions for keeping foreign insurgents out of Parliament stack up against those of other countries? Are our rules really that severe? Or is everywhere just as frightened of a Canadian double agent trying to run the Black Standard up the flag pole as we are?