Council of Trade Unions President Helen Kelly also questioned the appointment, saying the commission's roles should be independent of Government policy and Dr Blue's appointment directly from Parliament was a concern.
Ms Collins said Dr Blue was the top choice of the panel which interviewed her and three others. She said it was not unusual for people with political backgrounds to take on such jobs. "Not many people would want to put their names forward. It's a bit like the Race Relations Commissioner - whatever you do, someone will criticise."
Former MP Paul Quinn is next on National's list but has previously indicated he did not wish to return. National Party President Peter Goodfellow said if Mr Quinn did not wish to take the post, he understood the next in line - Paul Foster-Bell - was interested. Mr Foster-Bell, a diplomat, was a National Party candidate in 2011 and is Deputy Head of Mission at the NZ Embassy in Riyadh.
Dr Blue said she had applied for the job off her own bat and gone through a panel interview. She was "delighted" to have been chosen and had a track record in advocating for women. Dr Blue entered Parliament in 2005 as an Auckland-based List MP. She was known for her breast cancer advocacy.