James Duff, the executive director of the Supreme Court Historical Society, lamented the recordings in a statement.

"We condemn the surreptitious recording of Justices at the event, which is inconsistent with the entire spirit of the evening," Duff said.

In his statement, Duff, the society's executive director, said: "Attendees are advised that discussion of current cases, cases decided by current sitting Justices, or a Justice's jurisprudence is strictly prohibited and may result in forfeiture of membership in the Society."