Supreme court is deciding whether to hear secret case today.
https://www-m.cnn.com/2019/03/21/politics/supreme-court-mystery-grand-jury-subpoena-mueller/index.html
Others have decided that it's likely about the Qatari Investment Authory… probably related to Rosneft Glencore deal that closed early 2017 before inauguration. Glencore is Marc Rich, btw.