 This discretion is exercised very sparingly.It is exercised with somewhat greater frequency, although still sparingly, in the context of discovery disputes involving privileged materials, since a district court order erroneously forcing the disclosure of privileged material may never be remediable through a later appeal.In the case "In Re Electronic Privacy Information Center" (2013), privacy advocates sought a writ of mandamus directly from the Supreme Court to halt the National Security Agency's bulk phone record collection program.