The panel has expanded its probe and refused to rule out possible conclusion between the Trump campaign and Russian Federation, and the chairmen warned the Kremlin had not stopped its efforts to influence elections.
One witness the lawmakers say they've been unable to question is Christopher Steele, a former British spy believed to have compiled a dossier of allegations about Trump connections to Russian Federation.
"But we don't close our consideration of it", he added.
In a statement on Monday, Facebook said it would add more than 1,000 people over the next year and invest more in software to flag and take down ads automatically. "We believe that the american people deserve to know firsthand".
Burr added that investigators have "exhausted" every witness for pertinent information on the so-called "Comey memos", or notes that Federal Bureau of Investigation director James Comey kept to detail his interactions with the president.
The Republican said the panel can not determine the dossier's credibility without understanding who paid for it and who contributed to the material. "Who were your sources?" Richard Burr (R-N.C) told reporters Wednesday. Mark Warner, D-Virginia, asserted that they won't discuss their committee's specific initial Russian Federation investigation findings, they said that the results thus far have caused the inquiry to expand "slightly".
The committee has scheduled only a handful of public hearings, during which intelligence officials and the committee leaders have underscored that last year's elections probably have encouraged Russian Federation to interfere in future USA elections.
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The lawmakers said they would not release social media ads paid for by Russian agents to influence USA voters, but they hoped Facebook and Twitter would.
"I fear if you add up all those things it was a decent rate of return", Warner said. The tech giants came under intense pressure to disclose everything they knew about how foreign actors had exploited their platforms after Facebook said last month that 470 "inauthentic accounts" linked to Russian Federation had purchased political ads between 2015 and 2016. "What about the totally biased and dishonest Media coverage in favor of Crooked Hillary?"
More than 100 witnesses have been interviewed - including former Trump campaign chairman Paul Manafort and Trump son-in-law Jared Kushner - and more than 100,000 pages of documents have been reviewed, Burr said.
"I was concerned at first that some of these social media platform companies did not take this threat seriously enough", Warner said "I believe they are taking it seriously now".
Aside from oversight of the intelligence assessment, the probe includes an ongoing look into any collusion by either campaign with the Kremlin during the 2016 election, as well as ongoing Russian active measures. "If we use exclusively the social media advertising that we've seen, there is no way that you can look at that and say that that was to help the right side of the ideological chart and not the left, or vice versa", North Carolina Sen.
The Senate Intelligence Committee is trying to complete its work as quickly as possible, the two leaders said, but new strands have continued to arise, including the revelation that the Trump organization was negotiating during the election campaign to build a Trump Tower in Moscow. "I'm not going to even discuss initial findings, because we haven't any".