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FILE - In this April 15, 2012 file photo Eminem performs at the 2012 Coachella Valley Music and Arts Festival in Indio, Calif. The music publishers for American rapper Eminem are suing New Zealand’s ruling political party over the music it used in a campaign commercial. Eight Mile Style and Martin Affiliated both claim the National Party breached copyright laws by using Eminem’s song “Lose Yourself.” A spokesman for the two companies, Joel Martin, said they filed a case Tuesday, Sept. 16, 2014, in the New Zealand High Court and are seeking damages.(AP Photo/Chris Pizzello, File) Image Credit: AP

The music publishers for American rapper Eminem are suing New Zealand’s ruling political party over the music it used in a campaign commercial.

Eight Mile Style and Martin Affiliated both claim the National Party breached copyright laws by using Eminem’s song Lose Yourself. A spokesman for the two companies, Joel Martin, said they filed a case on Tuesday in the New Zealand High Court and are seeking damages.

The National Party said in a statement that it would vigorously defend the action. It said the music it used was originally published by Spider Cues Music in Los Angeles and sold to it by an Australian-based supplier.

The disputed ad depicts a boat filled with people rowing together, symbolising the party’s unity.

New Zealand’s general election is set for September 20.