The music streaming war is heating up.

Spotify claims that Apple is blocking competition after the App Store rejected an updated version of its iOS app. According to a letter Spotify sent to Apple’s legal team on June 26, Apple’s rejection stems from an anti-competitive practice to boost Apple Music. The letter was sent to some members of Congress this week and was originally reported by Recode.

“We cannot stand by as Apple uses the App Store approval process as a weapon to harm competitors,” wrote Spotify general counsel Horacio Gutierrez to Apple general counsel Bruce Sewell. Apple claimed that the new Spotify app was rejected because it violated “business model rules.”

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