Critics challenge new law in court.
United States President Barack Obama is facing a liberal backlash over his hardline national security policy, which critics say is more extreme and conservative than that pursued by George W. Bush.
Obama's nominee to be the next head of the CIA, White House adviser John Brennan, was grilled by the Senate intelligence committee over using drones to kill suspected Islamic militants amid a row over documents that lay out the legal rationale.
"The parallels to the Bush Administration torture memos are chilling," said Vincent Warren, executive director for the Centre for Constitutional Rights. "Those were unchecked legal justifications drawn up to justify torture; these are unchecked justifications drawn up to justify extrajudicial killing."
At a court hearing in New York liberal activists and journalists argued that a new Obama law - the National Defence Authorisation Act - has dealt a serious blow to civil liberties by allowing American citizens to be detained indefinitely without trial.