U.S. demands to seize emails stored on a Microsoft server in Ireland are threatening the privacy of U.S. citizens, Microsoft said in its appeal in an lawsuit that threatens international relations and may violate European privacy laws.

Microsoft is battling a U.S. district court ruling to hand over emails to U.S. law enforcement. The company was ordered to hand over the data despite its being stored on a server in Dublin. According to the district court, the location of the data is irrelevant and seeking cooperation with Irish authorities is unnecessary for a warrant’s powers to reach abroad.

However, there is “no way” the U.S. government would accept the reasoning the district court is using if other countries wanted to access data stored on U.S. soil, Microsoft said in a brief filed with the U.S. Court of Appeals for the Second Circuit on Monday. If the warrant is carried out, it would open the door to such seizures in the U.S., endangering the privacy of U.S. citizens, Microsoft said.

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