"The U.S. Supreme Court on Tuesday agreed to allow an unknown foreign company – owned by an unknown foreign government – to ask the justices to hear a legal challenge to a still-secret federal grand jury subpoena, which could be related to the Special Counsel probe into Russian interference in the 2016 elections, as the High Court released new information about the case and its appeal, indicating the unidentified country is a ‘witness’ in this mystery investigation."
http://jamiedupree.blog.ajc.com/2019/01/22/u-s-supreme-court-to-consider-appeal-in-mystery-grand-jury-case/