Senator Orrin Grant Hatch served as the President Pro Tempore of the United States Senate from January 3, 2015 through January 3, 2019.

Senator Hatch is an American attorney and retired politician who served as a United States Senator from Utah for 42 years (1977–2019). He is the longest-serving Republican U.S. Senator in history and the longest-serving U.S. Senator from Utah.