Senators Marsha Blackburn and Amy Klobuchar sent a letter to Meta CEO Mark Zuckerberg criticizing removal of attorney ads.
The ads were placed by lawyers recruiting plaintiffs for lawsuits alleging social media platforms cause youth mental health crisis.
Meta, Google, Snapchat and TikTok face thousands of lawsuits accusing them of designing addictive platforms.
Blackburn is running for Tennessee governor; Klobuchar is running for Minnesota governor, highlighting their focus on social media regulation.