Sen. Dianne Feinstein Dianne Emiel FeinsteinMcConnell says Trump nominee to replace Ginsburg will get Senate vote Top Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence Intensifying natural disasters do little to move needle on climate efforts MORE (D-Calif.) lashed out Wednesday at technology companies for failing to properly address how Russia used social media during the 2016 presidential race and how other foreign agents might use it in the future.

“I must say, I don’t think you get it,” Feinstein told representatives of Facebook, Google and Twitter.

“What we’re talking about is a cataclysmic change. What we’re talking about is the beginning of cyber warfare. What we’re talking about is a major foreign power with the sophistication and ability to involve themselves in a presidential election and sew conflict and discontent all over this country.”

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Feinstein, who is running for reelection in 2018 and facing a likely primary challenge from the left, was one of several senators to express frustration with the company representatives at a Senate Intelligence Committee hearing on Russia’s use of social media in the 2016 election.

She also expressed disappointment in the vague answers she received at the Judiciary Committee hearing on Tuesday, saying “that just won’t do.”

“You have a huge problem on your hands,” Feinstein said. “You have created these platforms and now they are being misused. And you have to be the ones to do something about it, or we will.”

Feinstein’s combative exchange was one of several during Wednesday’s hearing. Sens. Angus King Angus KingShakespeare Theatre Company goes virtual for 'Will on the Hill...or Won't They?' On The Trail: How Nancy Pelosi could improbably become president Angus King: Ending election security briefings 'looks like a pre-cover-up' MORE (I-Maine) and Joe Manchin Joseph (Joe) ManchinBiden promises Democratic senators help in battleground states Senate leaders quash talk of rank-and-file COVID-19 deal OVERNIGHT ENERGY: House Democrats tee up vote on climate-focused energy bill next week | EPA reappoints controversial leader to air quality advisory committee | Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' MORE (D-W.Va.) said they were disappointed the companies did not send their CEOs.

The panel's chairman, Sen. Richard Burr Richard Mauze BurrRep. Mark Walker says he's been contacted about Liberty University vacancy Overnight Defense: Trump rejects major cut to military health care | Senate report says Trump campaign's Russia contacts posed 'grave' threat Senate report describes closer ties between 2016 Trump campaign, Russia MORE (R-N.C.), told Facebook's general counsel that the site failed at its mission at times in 2016.

The Senate Intelligence Committee was the second of three hearings this week on Russia’s use of social media in the 2016 election. The third will take place before the House Intelligence Committee on Wednesday afternoon.