Sens. Amy Klobuchar Amy KlobucharBattle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates Klobuchar: GOP can't use 'raw political power right in middle of an election' MORE (D-Minn.) and John Kennedy John Neely KennedyMORE (R-La.) on Monday called for a Senate Judiciary Committee hearing to question major technology companies in the wake of a report that a data firm harvested information from millions of Facebook users.

Klobuchar and Kennedy asked Judiciary Chairman Chuck Grassley Charles (Chuck) Ernest GrassleyGOP set to release controversial Biden report McConnell locks down key GOP votes in Supreme Court fight Senate Republicans face tough decision on replacing Ginsburg MORE (R-Iowa) to call a hearing with CEOs from companies like Facebook, Twitter and Google.

“Important questions also remain unanswered about the role of these technology companies in our democracy. Major social media platforms store an enormous amount of data and have a user base larger than all of the major broadcasting companies combined,” the senators wrote.

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“The lack of oversight on how data is stored and how political advertisements are sold raises concerns about the integrity of American elections as well as privacy rights,” they added.

Representatives from Facebook, Twitter and Google have testified before congressional committees in the last year regarding Russian election meddling, but Klobuchar and Kennedy noted that the CEOs of each company have yet to appear.

Klobuchar on Saturday called for Facebook CEO Mark Zuckerberg Mark Elliot ZuckerbergHillicon Valley: Trump's ban on TikTok, WeChat in spotlight | NASA targeted by foreign hackers | Instagram accused of spying in lawsuit The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump contradicts CDC director on vaccine, masks Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll MORE in particular to testify before the Senate Judiciary Committee following a report that Cambridge Analytica, the data firm used by the Trump campaign, obtained the private information of more than 50 million people without their permission for campaign uses.

Facebook suspended Cambridge Analytica from its platform after reports it had not fully deleted data it obtained from Cambridge University professor Aleksandr Kogan.

The professor was found to have harvested more than 50 million Facebook profiles from his app, which required a Facebook login, despite only 270,000 having given permission for their data to be harvested.