Office of Senator Mark Dayton v. Hanson, 550 U.S. 511 (2007) is a United States Supreme court case in which the court held that it did not have jurisdiction under the Congressional Accountability Act of 1995 to review a wrongful termination suit brought against United States Senator Mark Dayton, where the lower courts did not rule on the constitutionality of the Act. This case was the first Speech or Debate Clause case the Supreme Court took up since 1979.