Internet search giant Google defied a legal challenge from the US Justice Department by vowing to "vigorously" fight a demand to reveal details about online searches.
US Attorney General Alberto Gonzales filed a legal motion in the Silicon Valley city of San Jose on Wednesday to enforce a subpoena requesting Google hand over a week's worth of data on online searches by Internet users.
The government says it needs the data to defend the constitutionality of the Child Online Protection Act in a federal court in the state of Pennsylvania.
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