https://www.senate.gov/art-artifacts/historical-images/prints-engravings/38_00555_001.htm
U.S. Senate: Hon. John Sherman, President Pro Tempore of the United States Senate.
Hon. John Sherman, President Pro Tempore of the United States Senate.
u s senatepresident pro tempore
https://newrepublic.com/article/120779/president-pro-tempore-orrin-hatch-and-need-succession-reform
President Pro Tempore Orrin Hatch and Need for Succession Reform | The New Republic
May 11, 2021 - It's time to amend the Constitution.
president pro tempore