Final answer:
The replacement process when a president cannot complete the term involves the Vice President becoming the President, with a new Vice President confirmed by Congress. If both are unable, the Speaker of the House and then the President pro tempore of the Senate are next in line.
Step-by-step explanation:
When a president cannot finish his term, the process for his replacement is outlined in the Twenty-Fifth Amendment of the United States Constitution. If the presidency is vacated, the Vice President becomes President and selects a new Vice President, subject to confirmation by both houses of Congress. If both the President and Vice President cannot serve, the Speaker of the House is next in line, followed by the President pro tempore of the Senate. The order of succession continues to the Cabinet members, starting with those of departments created earliest in history.
- Vice President of the United States
- Speaker of the House of Representatives
- President pro tempore of the Senate1