WASHINGTON — The Obama White House’s chief cyber official testified Wednesday that proposals he was developing to counter Russia’s attack on the U.S. presidential election were put on a “back burner” after he was ordered to “stand down” his efforts in the summer of 2016.

The comments by Michael Daniel, who served as White House “cyber security coordinator” between 2012 and January of last year, provided his first public confirmation of a much-discussed passage in the book, “Russian Roulette: The Inside Story of Putin’s War on America and the Election of Donald Trump,” co-written by this reporter and David Corn, that detailed his thwarted efforts to respond to the Russian attack.

View photos Former White House cybersecurity coordinator Michael Daniel, right, looks on as former Assistant Secretary of State Victoria Nuland, left, is greeted by committee vice chairman Mark Warner, D-Va. (Photo: Andrew Harnik/AP) More

They came during a Senate Intelligence Committee hearing into how the Obama administration dealt with Russian cyber and information warfare attacks in 2016, an issue that has become one of the more politically sensitive subjects in the panel’s ongoing investigation into Russia’s interference in the U.S. election and any links to the Trump campaign.

The view that the Obama administration failed to adequately piece together intelligence about the Russian campaign and develop a forceful response has clearly gained traction with the intelligence committee. Sen. Mark Warner, D-Va., the ranking Democrat on the panel, said in an opening statement that “we were caught flat-footed at the outset and our collective response was inadequate to meet Russia’s escalation.”

That conclusion was reinforced Wednesday by another witness, Victoria Nuland, who served as assistant secretary of state for Europe during the Obama administration. She told the panel that she had been briefed as early as December 2015 about the hacking of the Democratic National Committee — long before senior DNC officials were aware of it — and that the intrusion had all the hallmarks of a Russian operation.

View photos Victoria Nuland appears before a Senate Intelligence Committee hearing. (Photo: Andrew Harnik/AP) More

As she and other State Department officials became “more alarmed” about what the Russians were up to in the spring of 2016, they were authorized by then Secretary of State John Kerry to develop proposals for ways to deter the Russians. But most of those steps were never taken — in part because officials assumed they would be taken up by the next administration.

“I believe there were deterrence measures we could have taken and should have taken,” Nuland testified.

As intelligence came in during the late spring and early summer of that year about the Russian attack, Daniel instructed his staff on the National Security Council to begin developing options for aggressive countermeasures to deter the Kremlin’s efforts, including mounting U.S. “denial of service” attacks on Russian news sites and other actions targeting Russian cyber actors.

Daniel declined to discuss the details of those options during Wednesday’s open hearing, saying he would share them with the panel during a classified session later in the day. But he described his proposals as “the full range of potential actions” that the U.S. government could use in the cyber arena “to impose costs on the Russians — both openly to demonstrate that we could do it as a deterrent and also clandestinely to disrupt their operations as well.”

Sen. James Risch, R-Idaho, asked about a “Russian Roulette” passage in which one of Daniel’s staff members, Daniel Prieto, recounted a staff meeting shortly after the cyber coordinator was ordered by Susan Rice, President Obama’s national security adviser, to stop his efforts and “stand down.” This order was in part because Rice feared the options would leak and “box the president in.”

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