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 presidential campaign on Thursday hit Facebook 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 over a speech where the executive defended his company's decision not to take down political advertisements with inaccuracies.

“Facebook has chosen to sell Americans’ personal data to politicians looking to target them with disproven lies and conspiracy theories, crowding out the voices of working Americans," Bill Russo, the Biden campaign's deputy communications director, said in a statement.

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"Zuckerberg attempted to use the Constitution as a shield for his company’s bottom line, and his choice to cloak Facebook’s policy in a feigned concern for free expression demonstrates how unprepared his company is for this unique moment in our history and how little it has learned over the past few years,” Russo said.

Biden's campaign lashed out after Zuckerberg delivered a speech at Georgetown University where he argued that it is not Facebook's role to moderate political content.

“Political ads can be an important part of voice, especially for local candidates and up and coming challengers that the media might not otherwise cover,” he said. “Banning political ads favors incumbents and whoever the media chooses to cover.”

Zuckerberg and Facebook have received backlash over their policy for political ads, with criticism mounting recently after 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 reelection campaign released an ad targeting Biden.

The ad, which highlighted a line of attack from Trump against Biden, accused the former vice president — without evidence — of using his former office to pressure Ukrainian officials to drop an investigation into a company due to his son's financial interests.

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.) has been especially vocal about criticizing the policy, calling Facebook a “disinformation-for-profit machine.”

She hammered home the criticism by running a campaign ad falsely claiming that Zuckerberg supports Trump's reelection bid.