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Mr Williams was understood to have firstly been demoted to number 13 on the party's draft list. He subsequently blamed the demotion on deputy leader Tracey Martin, who he said was trying to remove him because she was threatened by him.
Mr Williams was dumped from the official party list, released this week.
"I remain committed to the ideals which New Zealand First represents," Mr Williams said.
"Recognised as a competent New Zealand First MP, ranked at number 3 in the party, I was given no reason for my demotion to 13th place.
"I do not, however, wish to derail NZ First's campaign, so I am asking for an urgent hearing following the election. As the matter is now before the Court, I do not intend to make further comment."
New Zealand First leader Winston Peters did not immediately respond to requests for comment.
Deputy leader Tracey Martin did not want to comment on whether Mr Williams was fairly treated.
"I'm not going to going to comment on whether it's fair or unfair. The process is the process, and we've got a list, and I'm going to spend the next 23 days campaigning for New Zealand First."