The Supreme Court heard arguments Tuesday morning in the case of Fischer v. United States, one of the many criminal cases arising out of the Jan. 6, 2021, riot at the U.S. Capitol. Like defendants in a large subset of those cases, Joseph Fischer was charged, among other offenses, with obstruction of an official proceeding under 18 U.S.C. 1512(c)(2). Fischer’s case in the Supreme Court challenges whether the events of that day can be prosecuted using this obstruction statute. Most of the justices seemed dubious, or at a minimum concerned, about the Department of Justice’s very broad interpretation of the...