WASHINGTON The Senate on Tuesday blocked a bill to end bulk collection of Americans' phone records by the National Security Agency, dealing a blow to President Barack Obama's primary proposal to rein in domestic surveillance.

The 58-42 vote was two short of the 60 needed to proceed with debate under Senate procedural rules. Voting was largely along party lines, with most Democrats supporting the bill and most Republicans voting against it. The Republican-controlled House had previously passed its ownNSAbill.

The legislation would have ended theNSA'scollection of domestic calling records, instead requiring the agency to obtain a court order each time it wanted to analyze the records in terrorism cases, and query records held by the telephone companies. In many cases the companies store the records for 18 months.

The revelation that the spying agency had been collecting and storing domestic phone records since shortly after the terrorist attacks of Sept. 11, 2001, was among the most significant by Edward Snowden, a former agency network administrator who turned over secretNSAdocuments to journalists. The agency collects only so-called metadata numbers called, not names and not the content of conversations. But the specter of the intelligence agency holding domestic calling records was deeply disquieting to many Americans.

The bill had drawn support from technology companies and civil liberties activists. Its failure means there has been little in the way of policy changes as a result of Snowden's disclosures.

Pressured to act, Obama in January proposed curbing theNSA's authority and the House in May passed a bill to do so. While the measure was pending, theNSAcontinued to collect American landline calling records, though the program does not cover most mobile phone records.

The law authorizing the bulk collection, a provision of the post-9/11 USA Patriot Act, will expire at the end of 2015. That means Congress would have to pass legislation re-authorizing the program for it to continue.

For that reason, Democratic Sen. Dianne Feinstein, the chairman of the Senate Intelligence Committee, abandoned her previous opposition to the bill. "If we do not pass the bill, we will lose this program," Feinstein said on the Senate floor.

"This bill increases trust and confidence and credibility of our intelligence system," said Democratic Sen. Richard Blumenthal.

But Sen. Saxby Chambliss, the ranking Republican on the Intelligence Committee, called the bill "totally flawed" and said theNSAneeds the ability to sift through domestic calling records and hold the records. "We have under surveillance any number of Americans who are committed to jihad," Chambliss said.

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Senate Republicans block bill: NSA will continue monitoring your calls (+video)