The Australian Greens have been rocked by a second resignation in less than a week after Queensland Senator Larissa Waters quit upon realising she, too, was a dual national.
Ms Waters is a citizen of both Australia and Canada, and was elected in 2010.
Prior to entering the senate in 2011 Ms Waters was on the staff of the labor-aligned Environmental Defenders Office, which was largely responsible for drafting the Vegetation Management Act that came in to law in 1999.
"I had not renounced since I was unaware that I was a dual citizen", Waters explained in a press conference earlier. The news comes just five days after Scott Ludlam, deputy leader of the Greens, announced his resignation for the same reason.
I left Canada as a baby, born to Australian parents studying and working briefly in Canada before they returned home.
Her parents had advised her she had until age 21 to seek Canadian citizenship, but never did so and thought the matter had ended there.
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"I was devastated to learn that because of 70-year-old Canadian laws I had been a dual citizen from birth, and that Canadian law changed a week after I was born and required me to have actively renounced Canadian citizenship", she said. Senator Water said the other foreign-born Greens Senators had checked and "my understanding is that everyone else is fine".
The Greens senator still holds dual citizenship, despite not returning to the country since she was 11-months-old.
Senator Waters last month made history by becoming the first woman to breastfeed her child while passing a motion before the Senate. "We have to strengthen our internal processes and we have to make sure that this doesn't happen again".
"I apologise wholeheartedly to all those who have supported me and helped me to become a representative for the wonderful people of Queensland over the last six years", she said.
It is unclear exactly who will replace Waters, and also Ludlam, but it is likely that the next person on the Greens ticket at the 2016 election in Queensland and Western Australia respectively will take their place in the Senate.