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A US judge has ruled the National Security Agency's mass collection of telephone data unconstitutional - reports BBC.
Federal District Judge Richard Leon said the electronic spy agency's practice was an "arbitrary invasion".
The agency's collection of "metadata" including telephone numbers and times and dates of calls was brought to light by ex-NSA contractor Edward Snowden.
The White House dismissed the suggestion Mr Snowden receive amnesty if he stopped leaking documents.
In his ruling in a Washington DC federal court on Monday, Mr Leon called the NSA's surveillance programme "indiscriminate" and an "almost Orwellian technology that enables the government to store and analyze the phone metadata of every telephone user in the United States".
The ruling came in a lawsuit brought by conservative activist Larry Klayman, who challenged the NSA's collection of metadata related to his Verizon account and that of a client.
The NSA had ordered Verizon - one of the largest phone companies in the US - to disclose metadata, including telephone numbers, calling card numbers and the serial numbers of phones, of all calls it processes in which at least one party is in the US.
Mr Leon ruled the plaintiffs had demonstrated "a substantial likelihood of success on the merits of their Fourth Amendment claim and that they will suffer irreparable harm absent… relief", referring to the clause in the US constitution that bars unreasonable search and seizure.
He issued a preliminary injunction against the NSA surveillance programme but suspended the order to allow for an appeal by the justice department.
Through Glenn Greenwald, a journalist with whom he has close ties, Mr Snowden issued a statement hailing the ruling.
"I acted on my belief that the NSA's mass surveillance programs would not withstand a constitutional challenge, and that the American public deserved a chance to see these issues determined by open courts," he wrote, according to the New York Times.
"Today, a secret program authorized by a secret court was, when exposed to the light of day, found to violate Americans' rights," he added. "It is the first of many".