The Department of Justice has issued a grand jury subpoena to the House of Representatives, raising a number of questions about the nature of an investigation currently shrouded in mystery.

Consistent with House rules, House Reading Clerk Susan Cole took the the House floor on Monday and read a letter from House Sergeant at Arms William McFarland informing the chamber of a DOJ subpoena.

The clerk read:

The Honorable, the Speaker, the House of Representatives. Sir, this is to notify you formally pursuant to Rule VIII of the rules of the House of Representatives that the Office of the Sergeant at Arms for the House of Representatives has been served with a grand jury subpoena for documents issued by the U.S. Department of Justice.

After consulting with the Office of General Counsel, I have determined that compliance with the subpoena is consistent with the rights and privileges of the House.

Signed, sincerely, William P. McFarland, Sergeant at Arms of the House of Representatives.

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What made the letter unusual is the glaring lack of detail contained in the letter, congressional reporter Jamie Dupree explained.

"When the Speaker is notified of a subpoena, the name of the court is always included," he wrote. "This one just says 'a grand jury subpoena for documents issued by the U.S. Department of Justice.' Who at DOJ is running a grand jury right now?"

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It is not exactly clear what the DOJ is investigating or who investigators are targeting. The DOJ declined to comment on the matter, ABC News reported.

However, Punchbowl News reported on Tuesday that Rep. Cori Bush (D-Mo.) is the focus of the investigation. Prosecutors are targeting her alleged "misspending of federal security money," Jake Sherman reported.

For years, Bush has been scrutinized for her spending on security services and whether she unethically misused campaign funds to pay for security. It's not clear if that spending is the subject of the investigation or if alleged misuses of her Member Representational Allowance is under scrutiny.

Bush declined to comment.

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