thumb|right|upright=0.80|John Tyler is the only Senate president pro tempore to later become President of the United States. On three occasions during the 19th century, the Senate was without both a president and a president pro tempore: from July 9 to July 11, 1850, following Millard Fillmore's accession to the presidency upon the death of Zachary Taylor, until William R. King was elected president pro tempore; from September 19 to October 10, 1881, following Chester Arthur's accession to the presidency upon the death of James A. Garfield, until Thomas F. Bayard was elected president pro tempore; from November 25 to December 7, 1885, following the death of Vice President Thomas A. Hendricks, until John Sherman was elected president pro tempore.
thumb|right|upright=080|John Tyler is the only Senate president pro tempore to later become President of the United States On three occasions during the 19th century the Senate was without both a president and a president pro tempore from July 9 to July 11 1850 following Millard Fillmore's accession to the presidency upon the death of Zachary Taylor until William R King was elected president pro tempore; from September 19 to October 10 1881 following Chester Arthur's accession to the presidency upon the death of James A Garfield until Thomas F Bayard was elected president pro tempore; from November 25 to December 7 1885 following the death of Vice President Thomas A Hendricks until John Sherman was elected president pro tempore