Obama could unveil his highly anticipated decisions as early as next week. On Thursday, the president met with congressional leaders at the White House to discuss the review, while White House staff planned to meet with privacy advocates. Representatives from tech companies are meeting with White House staff on Friday.
The White House says Obama is still collecting information before making final decisions.
Among the changes Obama is expected to announce is more oversight of the National Intelligence Priorities Framework, a classified document that ranks U.S. intelligence-gathering priorities and is used to make decisions on scrutiny of foreign leaders. A presidential review board has recommended increasing the number of policy officials who help establish those priorities, and that could result in limits on surveillance of allies.
Documents released by former National Security Agency systems analyst Edward Snowden revealed that the U.S. was monitoring the communications of several friendly foreign leaders, including German Chancellor Angela Merkel. The revelations outraged Merkel as well as other leaders, and U.S. officials say the disclosures have damaged Obama's relations around the world.
The president also is said to be considering one of the review board's most aggressive recommendations, a proposal to strip the NSA of its ability to store telephone records from millions of Americans and instead have phone companies or a third party hold the records. The NSA would be able to access the records only by obtaining separate court approval for each search, though exceptions could be made in the case of a national security emergency.
It's unclear whether Obama will ultimately back the proposal or how quickly it could be carried out if he does.
A House Intelligence Committee member, Rep. Peter King, R-NY, said he believes the surveillance changes under consideration go too far. But he said if Obama does decide to transfer U.S. phone metadata to a third party, he would work to salvage what he could of the program.
"It would be a question of the lesser of two evils," King said. "If by doing that, it protects the program or preserves it, I would do it, even though I don't think these reforms are necessary."
That White House review followed disclosures from Snowden, who leaked details of several secret government programs. He faces espionage charges in the U.S. but has been granted temporary asylum in Russia.
On Thursday, the senior lawmakers on the House Intelligence Committee said a classified Pentagon report showed that Snowden stole approximately 1.7 million intelligence files. Most of those documents concern current military operations and could potentially jeopardize U.S. troops overseas, according to Rep. Mike Rogers, R-Mich., and Rep. C.A. "Dutch" Ruppersberger, D-Md.
Before making his final decisions, the president is supposed to receive a separate report from a semi-independent commission known as the Privacy and Civil Liberties Oversight Board, which was created by Congress. However, that panel's report has been delayed without explanation until at least late January, meaning it won't reach the president until after he makes his decisions public.
Members of that oversight board met with Obama on Wednesday and have briefed other administration officials on some of their preliminary findings. In a statement, the five-member panel said its meeting with the president focused on the NSA phone collection program and the Foreign Intelligence Surveillance Court, which oversees the data sweeps.
It's unclear why Obama will announce his recommendations before receiving the report from the privacy and civil liberties board. One official familiar with the review process said some White House officials were puzzled by the board's delay. The report would still be available to Congress, where lawmakers are grappling with several bills aimed at dismantling or preserving the NSA's authority.
That official and those familiar with the White House review insisted on anonymity because they were not authorized to discuss the process by name.
Obama also met Wednesday with members of the U.S. intelligence community, which largely supports keeping the NSA surveillance programs intact.
Shortly after receiving the review board recommendations last month, Obama signaled that he could be open to significant surveillance changes, including to the bulk collecting of phone records.
"There are ways we can do it, potentially, that gives people greater assurance that there are checks and balances — that there's sufficient oversight and sufficient transparency," Obama said at a Dec. 20 news conference. He added that programs like the bulk collection "could be redesigned in ways that give you the same information when you need it without creating these potentials for abuse."
The president also has backed the idea of adding a public advocate position to the Foreign Intelligence Surveillance Court, which rules on many of the domestic surveillance decisions. The court typically hears only from the government as it decides cases, and the advocate would represent privacy and civil liberties concerns.
Last month, U.S. District Judge Richard Leon ruled that the NSA's bulk collection program appeared to violate Fourth Amendment protections against unreasonable searches, but he didn't issue a preliminary injunction against unreasonable searches because of expected appeals. Late Wednesday, Justice Department lawyers asked Leon to halt further proceedings in his court on the NSA case and a second NSA-related lawsuit until the U.S. Court of Appeals for the District of Columbia Circuit hears the government's appeal of his December ruling.
Government lawyers said they were asking for the judicial stay from Leon because they were concerned that further court proceedings could jeopardize classified information about the surveillance program.
Larry Klayman, the conservative lawyer who filed the suit, has said he plans to ask the U.S. Supreme Court to hear the case.
AP Intelligence Writer Kimberly Dozier and AP writer Stephen Braun contributed to this report.
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