The Senate Judiciary Committee has called on the executives of major social media companies to testify before the panel next month regarding child online safety.

Chairman Charles E. Grassley, R-Iowa, sent letters to the heads of Meta, Google, Snap and TikTok earlier this month seeking attendance at a hearing on June 23 titled “Examining Tech Industry Practices and the Implications for Users and Families: Is This Social Media’s Big Tobacco Moment?”

The letters went to Mark Zuckerberg, CEO of Meta, which owns Facebook and Instagram; Evan Spiegel, CEO of Snap, which owns Snapchat; TikTok CEO Shou Zi Chew; and Google CEO Sundar Pichai.

The CEOs have not yet committed to testify. Committee spokesperson Hannah Akey said that staff are in “active conversations” and hope to be able to confirm “sooner rather than later.”

Akey previewed the hearing in a statement Friday.