It was not immediately clear whether the federal investigation is broader than the ethics inquiry, but federal prosecutors have greater investigatory powers than congressional investigators do. Ethics investigations rarely result in discipline against members of Congress.
The investigation came to public attention on Monday when the clerk of the House read aloud a required notification by the House sergeant-at-arms that he had received a grand jury subpoena from the Justice Department for documents.
“After consulting with the Office of General Counsel, I have determined that compliance with the subpoena is consistent with the rights and derivatives of the House,” William McFarland, the sergeant-at-arms, wrote in the notice.
Punchbowl News earlier reported that the subpoena and investigation pertained to Ms. Bush.
The Justice Department declined to comment. A spokeswoman for Ms. Bush did not immediately respond to a request for comment.
Ms. Bush was investigated in 2023 after the conservative group Foundation for Accountability and Civic Trust filed a complaint over her security payments.