Supreme Court won't hear 'Mystery Case' in Mueller probe

A day after the outlines of the Special Counsel investigation were delivered to the Congress, the U.S. Supreme Court kept alive one part of the Russia probe, refusing to hear arguments in the so-called "Mystery Case" involving an unknown foreign company owned by an unidentified foreign government, which is trying to get out of a subpoena for grand jury testimony involving the Mueller investigation.

In a simple order issued by the Justices on Monday morning, the Court refused to allow arguments on efforts to block the grand jury subpoena, in a case which has proceeded with dramatic secrecy through the courts over the past few months.

"The petition for a writ of certiorari is denied," the order stated, in the case officially known as "In Re Grand Jury Subpoena."

The unidentified company has argued that federal laws don't allow foreign governments or businesses to be ensnared in criminal cases in the U.S. - while the involvement of prosecutors from the Special Counsel's office was finally revealed in recent weeks, it's still not clear what company, what country, or what information is at play in this grand jury subpoena fight.

The lack of information about the case has left legal experts grasping for clues - and now with the Mueller investigation wrapping up its work - it’s not clear how long legal battles like this one over testimony will continue in the courts.

Cox Media Group