Andrew SolenderPhoto illustration: Allie Carl/Axios. Photo: The Washington Post/Getty ImagesThe U.S. House's chief administrative officer informed congressional staffers Monday that messaging app WhatsApp is banned on their government devices, Axios has learned.Why it matters: The ban, which centers on the vulnerability of staffers' data, comes as Congress is also taking steps to limit the use of AI programs it deems similarly risky.The chief administrative officer has in recent years set at lea...