A cabinet minister expects New Zealand to sign up to the UN Compact on Migration, despite no official word from the government.

Last week 164 governments adopted the global compact, which is not legally binding.

The government is yet to make an official decision on the issue.

Police Minister Stuart Nash told Mike Yardley it's looking likely we'll accept it but there's more water to go under the bridge.

"This isn't a binding document, but I think that we will be signing up. Keep in mind this is about NZ going to the world saying we are a decent country and we do the right thing."

With confusion on who is in charge making the decision, Nash said the Prime Minister is getting input from all corners of the party.

"She trusts her ministers to make the right decision. We have a world class immigration process which does a good job for the country."

National MP Mark Mitchell has been one of the strongest opponents against the bill, and told Mike Yardley the whole process has been shrouded in secrecy, and it exposes the governments flaws when it comes to immigration.

"Winston Peters will lose his remaining three percent vote, this is a deeply unpopular bill. The confusion surrounding this has been staggering. I am not a big fan of the UN, I would like them to focus on the real issues rather than these weird documents on global immigration."

LISTEN ABOVE AS STUART NASH AND MARK MITCHELL SPEAK TO MIKE YARDLEY