28 U.S.C. § 528

The Attorney General shall promulgate rules and regulations which require the disqualification of any officer or employee of the Department of Justice, including a United States attorney or a member of such attorney’s staff, from participation in a particular investigation or prosecution if such participation may result in a personal, financial, or political conflict of interest, or the appearance thereof. Such rules and regulations may provide that a willful violation of any provision thereof shall result in removal from office.