<Li> 1 President had never served in elected public office, the military, or government before becoming President: Donald Trump was a real estate developer, businessman, and television personality who was the chairman of the Trump Organization . </Li> <Li> 1 President served as Speaker of the House of Representatives, James K. Polk . </Li> <Li> 1 President served as President pro tempore of the United States Senate, John Tyler . </Li> <Li> 1 President served as Party leader of the United States Senate, Lyndon B. Johnson . </Li>

Us presidents who did not have a vice president