Hillary Clinton sat down for a three-and-a-half-hour "voluntary interview" at FBI headquarters Saturday, ABC News reports. According to CBS News, the interview was one of the final steps in the federal investigation into Clinton's use of a private email server before investigators recommend whether or not charges should be filed. “She is pleased to have had the opportunity to assist the Department of Justice in bringing this review to a conclusion,” a spokesperson says. Investigators have already interviewed Clinton's close aides, and the Justice Department wants to decide on possible charges before the Democratic National Convention in July. (More Hillary Clinton stories.)