US rapper Eminem has sued New Zealand's National Party after they allegedly used "Lose Yourself's" tune in one of their electoral campaigns.

Eminem's publishing company Eight Mile has revealed that the National Party infringed the rights of the Grammy and Academy Award winning song, the same song that was featured in the film "8 Mile," in which Eminem was cast as a struggling rapper, according to the Business Standard.

"In proceedings filed Tuesday in the Wellington Registry of the High Court of New Zealand, Eight Mile Style, LLC and Martin Affiliated, LLC, the Detroit-based publishers of Eminem's copyrights, are seeking damages for copyright infringement against the New Zealand National Party, a statement read.

Meanwhile, the National Party confirmed that they received the said complaint but stressed that they completely rejected the allegations because they believe they did not infringe anything.

The party's campaign manager also insisted that they have gone through all the necessary licensing procedures before "Lose Yourself" was used as part of their campaign.

"The National Party will be defending this action vigorously. As the matter is now before the courts we will not be making any further public comment," the party's official statement read.

Meanwhile, the official statement filed in court on Tuesday countered such statements, the Daily Mail reported.

"Eminem's publishers were not approached for permission to use any of Eminem's songs for this campaign advertisement. It is both disappointing and sadly ironic that the political party responsible for championing the rights of music publishers in New Zealand by the introduction of the three strikes copyright reforms should itself have so little regard for copyright."

The statement continued, "We do not hesitate to take immediate action to protect the integrity of Eminem's works, particularly where a party, as here, has sought to associate itself with Eminem and his work."