By Devlin Barrett, Jared A. Favole and Siobhan Gorman 

WASHINGTON--The White House outlined broad changes to end the government's mass collection of telephone records, saying Thursday that Congress must pass legislation to allow intelligence agencies to have speedy access to information held at telephone companies.

"I have decided that the best path forward is that the government should not collect or hold this data in bulk," President Barack Obama said in a written statement, expressing confidence his approach would "provide our intelligence and law enforcement professionals the information they need to keep us safe while addressing the legitimate privacy concerns that have been raised."

Under the president's proposal, details of which were revealed earlier this week, the government will no longer store such telephone records in bulk. Instead those records would remain at phone companies, to be searched when officials obtain a court order, or without a court order in cases of emergencies.

Once a judge has approved such a query for a specific target, the searches could continue for a specified time period without further court approvals, meaning the NSA could run daily searches to see what new numbers have been called by the target and the target's contacts.

Such searches would also be limited to only two "hops" from the suspect phone number. One hop would be access to all the incoming and outgoing calls on a suspected number, while the other hop would be the call logs of any phone linked to the original number.

Under the proposal, the phone companies would be "compelled" to provide technical support to ensure the records are in a format that can be searched and quickly transmitted to the government.

As the White House has acknowledged, the president's proposal must be passed into law by Congress. Legislation similar to the president's bill has been proposed in Congress, but its future is uncertain. Until Congress adopts changes, the administration will continue to seek reauthorization of the current program every 90 days.

But without congressional action, the current phone-records-surveillance program will expire in mid-2015.

Verizon Communications Inc. approached the White House plan and other legislative proposals to shift the searches of phone data to companies cautiously, praising the end to bulk records collection but wary of implementation details.

"Companies should not be required to create, analyze or retain records for reasons other than business purposes," said Randal Milch, Verizon's executive vice president for public policy and general counsel.

Reaction was mixed among critics of U.S. surveillance practices. Sen. Patrick Leahy (D., Vt.), chairman of the Senate Judiciary committee, said the president's plan wasn't sufficient.

"The President's proposal is promising, but true reform must be comprehensive," he said. "We must end the bulk collection of phone records, but we also must ensure that other authorities are not used for similar types of bulk collection."

Mr. Leahy is sponsoring a bill that would outlaw all types of so-called bulk collection of American records. He said other government-surveillance practices also need to be reformed as well, such as the Federal Bureau of Investigation's national security letters, which it uses to obtain without judicial oversight.

Privacy groups reacted tepidly to Mr. Obama's plan, saying it only addresses some of their concerns.

"Although we appreciate the president's efforts and look forward to working with the White House to end the bulk collection of telephone records, the time has passed for half-measures that only address a small sliver of the NSA problem, and the time has come for leaders in Congress to stop waiting to see what the President will do," said Kevin Bankston, policy director the New America Foundation's Open Technology Institute.

He said he prefers a bill sponsored by Rep. James Sensenbrenner (R., Wis.) and Mr. Leahy, which more narrowly limits the type of searches NSA can request of phone companies, and bans all types of bulk collection of American records.

The White House plan wouldn't outright ban any type of bulk-record collection; it just ends the bulk collection done under NSA's phone program.

Write to Devlin Barrett at devlin.barrett@wsj.com, Jared A. Favole at jared.favole@wsj.com and Siobhan Gorman at siobhan.gorman@wsj.com

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