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Mr Walker, the managing partner of Walker Weir Property Management, said in an email to the Otago Daily Times he was interested in the nomination. However, the rules prevent him from talking until the selection process is completed.
National Party southern regional chairwoman Ele Ludemann said nominations closed at noon and the board had to approve anyone nominated. Anyone approved went to a selection meeting.
''We don't give names at this stage and rules prevent anyone nominated from speaking publicly. We are expecting to complete selection early next week,'' she said.
Mr Walker's LinkedIn profile says he attended John McGlashan college between 1996 and 2001, putting him in his early 30s.
His personal details on his company's website mention his community involvement, including being a community street patrol member, mentoring children living with diabetes, coaching a girl's high school soccer team and being a member of the Remuera Rotary Club.
He is also a rugby referee and a member of the National Development Group.
At the last election, National candidate Jo Hayes, now a list MP based in the North Island, helped cut Labour MP Clare Curran's majority and helped National win the party vote in the traditional Labour seat.
Ms Curran is Labour's candidate this year.