Understandably, much of the commentary following the release of the Supreme Court’s blockbuster decision in Trump v. Mazars USA, LLP has focused on the impact of the Court’s ruling on the long-running quest for the President’s tax returns and other financial records.  Buried in the Court’s opinion, however, is an easily overlooked aside regarding the attorney-client privilege that could have significant implications for private parties responding to requests from congressional investigators. As our colleagues have…