EXCLUSIVE — A Republican senator is claiming Facebook responded to her inquiry about the company’s harmful effects on children by suggesting it hasn’t done anything wrong, refusing to give access to relevant internal research, and egregiously misleading Congress and its users.

GOP Sen. Cynthia Lummis of Wyoming sent a letter to the tech giant in late October asking for internal research regarding the platform’s negative effects on children that Facebook whistleblower Francis Haugen first brought to light and asked the company for how it would resolve these significant issues and equip parents with the right tools to help their children.