Following Labor Senator Katy Gallagher's disqualification from Parliament, four MPs with the same predicament have resigned.
Attorney-General Christian Porter says therefore it's time for Labor MPs Susan Lamb, Justine Keay and Josh Wilson, as well as independent Rebekha Sharkie to stand down, given their British ancestry.
"(Opposition Leader) Bill Shorten must require the resignation of those three Labor members today, and that must occur before close of business today".
Gallagher, who was born in Ecuador to British parents and was conferred British citizenship, filed paperwork and paid processing fees to renounce it more than two months before being elected in July 2016.
Under Section 44 of the Australian Constitution, members of parliament are unable to have citizenship in another country, and must prove that they took "all reasonable steps" to renounce their citizenship before being elected.
Gallagher said she had always acted on legal advice which indicated she satisfied the eligibility requirements.
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Labor already faces a byelection for the seat of Perth, with Tim Hammond announcing last week he would resign for family reasons. But she respected court's decision.
At a hearing in March, lawyers for the government argued Ms Gallagher failed to renounce her United Kingdom citizenship before the last election because she left the application too late and did not attach the right documents to her letter to authorities.
"The Labor Party will now consider what further implications today's decision by the High Court may have", he said in a statement. My paperwork was lodged and received by the UK Home Office before the election was called.
"She is an enormously talented asset for the Labor party and we will do everything we possibly can to see that she has the long career ahead of her that she deserves", Ms Plibersek told reporters in Canberra.
Katy Gallagher has been ruled ineligible for parliament.
In response, the former Labor senator's lawyers said the ACT birth certificate sent with the original renunciation form listed her father's United Kingdom birthplace, and therefore was sufficient proof he was a United Kingdom citizen.