1. Be a "natural born citizen" of the United States (this is controversial, as the term is not defined in the Constitution).
2. Have been a resident within the United States for fourteen years.
3. Be thirty-five years of age.
4. Have not been President for two terms, or have not acted as President for more than two years of a term to which some other person was elected President.
These legal requirements have remained the same since George Washington accepted the presidency.
