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"It is the hardest thing about my entire time in government to defend," the former senior Obama administration official told the Post. "I feel like we sort of choked."

The Post report details how the CIA's assessment that Putin was directly involved in a cyber campaign to disrupt and discredit the US presidential election in an effort to help Trump prompted the Obama administration to debate dozens of options for deterring or punishing Russia. Those included proposed cyberattacks on Russian infrastructure, the release of CIA-gathered material that might embarrass Putin and economic sanctions, the newspaper reported.

But President Barack Obama ultimately approved only modest measures: the expulsion of a few dozen diplomats, the closure of two Russian compounds, and narrowly targeted economic sanctions that some who designed them described as largely symbolic, the Post said. Another measure, the planting of cyberweapons in Russia's infrastructure, was still in the planning stages when Obama left office.

While some closest to Obama defend the response, saying that by late summer it was already too late to prevent troves of hacked emails from transferring to WikiLeaks and other groups, others expressed regret, the newspaper said.

Tony Blinken, Obama's former deputy national security adviser, said Friday that the administration took significant action to prevent Russia from interfering with the electoral system itself.

"We made massive efforts so they couldn't do that," Blinken told CNN's Kate Bolduan on "At This Hour." "This led to two things: President Obama issued a very stark warning to President Putin in September at the G-20 conference in China. What we saw, or thought we saw, after that, it looked like the Russians stopped their efforts. But the damage was already done."

The report, which features three-dozen high-level officials, confirms what many Democratic lawmakers already believed about Putin, Sen. Jeff Merkley said Friday on CNN's "New Day."

"Nothing like the extensive hacking effort and manipulation effort could occur without his involvement," the Oregon Democrat told CNN's Alisyn Camerota. "Now we actually know: Yes, Putin directed it."

"He had a specific goal to defeat (Democratic nominee) Hillary Clinton and that explains the huge coordinated effort from the botnets to the trolls," Merkley added.

Officials in the Post article suggested Obama struggled to find a way to respond to Putin without being so aggressive that he would be perceived as trying to influence the election in Clinton's favor -- a point Merkley echoed Friday.

"It is such a dilemma, because if he had acted aggressively, in a way that he had gone public and said, 'This is why we're doing this,' it would have been seized upon as an attempt to bias the election," Merkley said. "So, there was enormous bias in the election because of the Russians, but how do you balance that out without further damaging it? It is an extremely difficult problem."

Rep. Adam Kinzinger said Friday that he didn't find the Post report shocking.

"I think President Trump was legitimately elected by people who voted for him, but this is a very serious issue about defending democracy and our country and integrity of the election system," he told CNN's David Gregory on "New Day." "So we have to go back to countering Russia disinformation. Congress has to work with the White House to give them tools to push back. This is a very serious issue."

The Illinois Republican, who serves on the House Committee on Foreign Affairs, said Republicans must take the intelligence about Russia's involvement in the election very seriously to protect future elections.

"The reality is, in two or four years it will serve Vladimir Putin's interest to take down the Republican Party," Kinzinger said. "If we weren't upset about it, we have no right to complain in the future." Also speaking Friday morning on "New Day," White House counselor Kellyanne Conway dismissed the idea that Russia influenced the 2016 presidential election."I think it's very important to show no nexus has been proven between what Russia or any other foreign government tried to do in the actual election result," Conway said. "Really the only person making that case prominently is Hillary Clinton."

"You've got everyone saying that there is no nexus, that not a single vote was changed and we're going to stand by that," Conway added. "We know that Donald Trump won fairly and squarely 306 electoral votes. It had nothing to do with interference."

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WaPo: Obama admin 'choked' on Russia, former official says ...