The United States Presidential line of Succession define who may become or act as the President of the United States upon the incapacity, death, resignation or removal from office (by Impeachment and subsequent conviction or pardoning) of a sitting president or president-elect.
The Presidential line of succession is as follows:
1 Vice President of the United States
2 Speaker of the House
3 President pro tempore of the Senate
4 Secretary of State
5 Secretary of the Treasury
6 Secretary of Defense
7 Attorney General
8 Secretary of the Interior
9 Secretary of Agriculture
10 Secretary of Commerce
11 Secretary of Labor
12 Secretary of Health and Human Services
13 Secretary of Housing and Urban Development
14 Secretary of Transportation
15 Secretary of Energy
16 Secretary of Education
17 Secretary of Veterans Affairs
18 Secretary of Homeland Security