“The one area that was impacted was voter file data," Trevelyan said in a statement obtained by ABC News. "We are confident at this point that no campaigns have access to or have retained any voter file data of any other clients; with one possible exception, one of the presidential campaigns. NGP VAN is providing a thorough report to the DNC on what happened and conducting a review to ensure the integrity of the system."
"We immediately began an audit to determine if any users had intentionally or unintentionally gained access to data they normally would not have access to. And determined that only one campaign took actions that could possibly have led to it retaining data to which it should not have had access," Trevelyan said.