WASHINGTON D.C. - Apple CEO Tim Cook is challenging a judge's order that the technology company assist the FBI with unlocking an iPhone, used by accused terrorist Syed Farook.
The federal government says it needs to have access to any records in Farook's phone, in order to track leads to ISIS.
Apple says the order could endanger phone privacy, for hundreds of millions of law-abiding citizens around the world.
Cook published a bullish, open letter, pledging to fight the ruling that it should give FBI investigators access to encrypted data on the device.
Cook says to comply with the order sets a dangerous precedent.
Apple has five days to respond to the court if it believes that compliance would be burdensome.
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