Sens. Amy Klobuchar and John Kennedy 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 committee chairman Sen. Chuck Grassley 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.

Read more at The Hill.