Green Party co-leader James Shaw is waiting for results of a Covid-19 test after visiting South Auckland.
Mr Shaw is self-isolating in Wellington after experiencing cold symptoms.
The Green Party released its housing policy in Weymouth, near Manuwera on Sunday.
"I developed minor cold symptoms after returning to Wellington from Auckland at the weekend," Mr Shaw said.
"I remind all of us that we must take any symptoms seriously and be tested if advised to do so by medical professionals.
"We all have a role to play in keeping Covid-19 out of our communities, and that includes following the advice of health experts."
Auckland is in Alert Level 3, after a new outbreak of Covid-19 emerged on Monday in the city's south.
The Green Party was the only political party that did not hold a media conference yesterday.