European Union lawmakers and legal scholars have waded into the fight at the U.S. Supreme Court between Microsoft and the Justice Department, arguing that forcing the tech giant to turn over emails stored in Ireland would violate the General Data Protection Regulation (GDPR).

In one of many amicus briefs filed Thursday on behalf of Microsoft, attorneys at White & Case wrote for European Parliament members, including Jan Philipp Albrecht, and former EU Justice Commissioner Viviane Reding. They argue that the U.S. government must work through bilateral treaties in order to lawfully obtain the data.