Sen. Elizabeth Warren Elizabeth WarrenOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Warren, Khanna request IG investigation into Pentagon's use of coronavirus funds MORE (D-Mass.) blasted Facebook Wednesday for its refusal to remove an ad from President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE's campaign attacking former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE's efforts to oust a prosecutor in Ukraine.

The ad implies Biden sought to fire the prosecutor because he had been investigating the company where Biden's son served as a board member.

There's no evidence showing Biden sought to fire the prosecutor to protect his son. The Obama administration repeatedly said it sought to oust the prosecutor because of concerns he was not doing enough to root out corruption.

“Facebook already helped elect Donald Trump once. Now, they're deliberately allowing a candidate to intentionally lie to the American people. This is a serious threat to our democracy,” Warren tweeted Wednesday. “We need transparency and accountability from Facebook.”

Facebook already helped elect Donald Trump once. Now, they're deliberately allowing a candidate to intentionally lie to the American people.



This is a serious threat to our democracy. We need transparency and accountability from Facebook. https://t.co/anu0pWSqS5 — Elizabeth Warren (@ewarren) October 9, 2019

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Facebook announced this week that it would not remove the 30-second video from the Trump campaign, saying its decision was “grounded in Facebook's fundamental belief in free expression, respect for the democratic process, and belief that in mature democracies with a free press, political speech is already arguably the most scrutinized speech there is.”

Trump’s attempts in a July call to pressure Ukrainian President Volodymyr Zelensky to investigate the Bidens is at the heart of a whistleblower complaint that led to House Democrats’ impeachment inquiry against him.

CNN said last week it would refuse to run one of the ads from the Trump campaign attacking Biden because it did not meet its advertising standards.

Warren has stepped up her criticism of Facebook in recent days in the wake of a leaked recording of CEO Mark Zuckerberg Mark Elliot ZuckerbergHillicon Valley: Productivity, fatigue, cybersecurity emerge as top concerns amid pandemic | Facebook critics launch alternative oversight board | Google to temporarily bar election ads after polls close Conservative groups seek to block Facebook election grants in four swing states: report Facebook critics launch alternative oversight board MORE in which he vowed the company would “go to the mat” in the event of a potential Warren administration investigating the company.

“Facebook has incredible power to affect elections and our national debate. Mark Zuckerberg is telling employees that he views a Warren administration as an ‘existential’ threat to Facebook,” she tweeted Monday. “The public deserves to know how Facebook intends to use their influence in this election.”

Facebook has incredible power to affect elections and our national debate. Mark Zuckerberg is telling employees that he views a Warren administration as an “existential” threat to Facebook. The public deserves to know how Facebook intends to use their influence in this election. — Elizabeth Warren (@ewarren) October 7, 2019

The Hill has reached out to Facebook for comment.

In a blog post in September, Facebook Vice President of Global Affairs and Communications Nick Clegg wrote, "We rely on third-party fact-checkers to help reduce the spread of false news and other types of viral misinformation, like memes or manipulated photos and videos."

"We don’t believe, however, that it’s an appropriate role for us to referee political debates and prevent a politician’s speech from reaching its audience and being subject to public debate and scrutiny," he added.

Facebook and other social media platforms came under intense scrutiny in 2016 after Russia was found to have launched a disinformation campaign in the lead-up to the election.