Queensland Greens senator Larissa Waters has followed Western Australian colleague and co-deputy leader Scott Ludlam out of the Senate this afternoon, revealing she was unaware that she had Canadian citizenship and thus had also fallen foul of section 44 of the constitution.

According to a statement by Waters, she was born in Canada while her Australian parents were briefly living there and left as an 11-month old, but this was sufficient to give her Canadian citizenship despite subsequent legal changes in Canada that would have prevented that. On Friday, Scott Ludlam revealed he had learnt he had retained New Zealand citizenship despite leaving the country as a child and being naturalised as an Australian.