Lawmakers overseeing US spy agencies have proposed stricter limits on the government's electronic surveillance while also calling for bolstering its authority to track terror suspects coming to America.
Senator Dianne Feinstein, chair of the Senate Intelligence Committee, defended the National Security Agency's collection of phone and email records as legal on Thursday, but said she and other panel members favoured reforms to bolster oversight and restrict some data collection.
"Among other things, we are considering provisions to do the following: place limits on NSA's phone metadata program to change but preserve this program," Feinstein said at a committee hearing with intelligence chiefs.
While calling for tougher rules, the senator also said she backed measures to enhance the government's spying authority to monitor terror suspects entering the United States.
The move was needed because current rules require the NSA to halt surveillance once the suspect sets foot on American soil, she said.
"These are known as roaming incidents. Of course, this collection is stopped just as the individual may be - may be - of the greatest concern," she said.
In the wake of revelations by intelligence leaker Edward Snowden about the government's electronic dragnet, Feinstein lamented media reports that she said had often "inaccurately" portrayed the NSA's work and had unfairly sowed public distrust of the spy agencies.
However, a tense exchange at the hearing underscored lingering questions and concerns among some lawmakers about the scope of NSA surveillance.
The head of the National Security Agency, General Keith Alexander, sidestepped questions from Senator Mark Wyden about whether the government has ever used or planned to use mobile phone data to track the location of Americans.
Alexander said the NSA can only collect "cell phone site" data with a specific court order but did not give a clear yes or no answer to the question.
The Foreign Intelligence Surveillance Court, which oversees the NSA's eavesdropping, has ruled that the agency would need to ask for court approval to collect geographic location information from mobile phone signals.
