A bi-partisan amendment to the Department of Defense Appropriations bill sponsored by Reps. Justin Amash (R-MI) and former House Judiciary Chair John Conyers (D-MI), was defeated late today in the U.S. House of Representatives. The measure would have brought an abrupt halt to the NSA’s warrantless blanket collection of Americans’ telephone records. It failed by a narrow margin of 205 to 217.

The Amash-Conyers amendment represented the first Congressional challenge to the NSA’s bulk collection of domestic phone records in the wake of recent disclosures by former NSA contractor Edward Snowden. The vote came just one day after a speech by Sen. Ron Wyden (D-OR), who has served on the the U.S. Senate Intelligence Committee since January 2001, in which he not only warned about the unlimited scope of the NSA’s ever-expanding surveillance capabilities but the unnecessary development of a secret body of laws that, he argued, threatens to eradicate the very essence of democracy and accountability.

Ironically, NSA Director General Keith Alexander, did his best to underscore Wyden’s warnings. Where the Obama administration and other members of both the Senate and House Intelligence Committee publicly lobbied against Amash-Conyers, Alexander scheduled “a last-minute, members-only briefing” to lobby against the measure behind closed doors.

Alexander, whom James Bamford, author of The Shadow Factor: The Ultra-Secret NSA from 9/11 to the Eavesdropping on America, has described as “the most powerful person that’s ever existed in the American intelligence community,” took pains to insure that his own efforts to privately lobby against this public bill be classified as “Top Secret,” thereby precluding public consideration as to the reasons why publicly-elected officials might refuse to rein in unfettered access to the telephone records of millions of law-abiding Americans.

Rather than look at today’s vote as a defeat, the ACLU’s Michelle Richards told The Guardian’s Spencer Ackerman that the vote’s narrow margin reflects “a ‘sea change’ in how Congress views bulk surveillance,” describing the bi-partisan debate on the House floor as “a great first step.”

Guardian journalist Glenn Greenwald, who originally broke a number of the stories related to Snowden’s disclosures, tweeted during the floor debate: “Edward Snowden did what he did to make everyone aware of all this, and to prompt precisely this debate. That was his motive.” He also observed this irony, after the House Democratic leadership rallied against the amendment and the measure ultimately went down to narrow defeat: “A majority of Dems supported the Amash/Conyers amendment to defund NSA bulk spying – majority of GOP joined [with the White House].”

UPDATE 7/25/13: According to AP today, Congressional “Opponents of the National Security Agency’s collection of hundreds of millions of Americans’ phone records insist they will press ahead with their challenge to the surveillance program after a narrow defeat in the House”…