American rapper Eminem is engaged in a fight down under. The Detroit-based rapper, legally named Marshall Mathers, has sued New Zealand’s National Party for copyright infringement. As reported by the Guardian, the suit alleges that the political party was using Eminem’s Academy Award winning song Lose Yourself in campaign ads for the Prime Minister John Key’s re-election bid.

The high court in Wellington confirmed the suit on Tuesday. In a statement the National Party admitted they had been informed of the alleged copyright infringement two weeks ago and pulled the offending ad but that “this has not satisfied the complaint.” The Party announced that they “will be defending this action vigorously.”

The New Zealand Herald quotes Joel Martin, representing the song’s publishers, as saying they “were not approached for permission to use any of Eminem’s songs for this campaign advertisement.” The National Party argues they purchased the rights from Australian music supplier Beatbox, and thus thought they were going by the book. According to the Herald, if the case is decided against the National Party, they will very likely have be able to force Beatbox to help them pay a rumored five-figure settlement fee.

Eminem has yet to comment directly on the suit.