MPs quit after Labor Senator found ineligible to sit in parliament

Four MPs have resigned their seats in parliament following a High Court ruling disqualifying their Senate colleague Katy Gallagher.

The court found Ms Gallagher was a British citizen at the time of her election, despite her attempts to renounce it, and ineligible for office.

Labor MPs Justine Keay, Josh Wilson and Susan Lamb told parliament on Wednesday the High Court’s disqualification of Ms Gallagher had changed the understanding of dual citizenship and eligibility laws.

“Until today’s decision the reasonable steps test had been accepted for more than 25 years in this country,” Mr Wilson said.

Senator Katy Gallagher was found ineligible to sit in parliament. Source: AAP/File

All three fell foul of a constitutional requirement that prospective MPs renounce their foreign citizenship before nominating to enter federal parliament.

Surrounded by colleagues, each indicated they would contest their seats in by-elections.

“I am not done yet. I intend to be back,” Ms Lamb said.

While she made it clear her speech was not a valedictory, Ms Keay took a moment to list her career highlights before announcing her decision.

Centre Alliance MP Rebekha Sharkie speaks during a press conference at Parliament House in Canberra. Source: AAP

“I want to make it very clear to every member of my community and every member of this house that I am not done working and fighting on behalf of those who sent me here,” she said.

Independent MP Rebekha Sharkie also resigned from parliament in an announcement on Wednesday afternoon.

Ms Sharkie, who won the South Australia seat of Mayo as a candidate for the Nick Xenophon Team, intends contesting a by-election for Centre Alliance.

“I don’t believe that my job here is finished,” she told reporters in Canberra.