Death or impeachment. They can resign, but I don't think this has ever happened.
Nixon resigned his office and Ford took over the presidency.
The actual term of office as stated in the US Constitution, Article III, is that they shall serve "during good behavior." This means that they serve for life but may be impeached and removed from office if convicted of the same offenses that the President may be impeached and removed for.
Recall
John Kennedy and Franklin Roosevelt had well-documented love affairs while they were President. Woodrow Wilson had a very close female friend that he wrote to, but may have been faithful to his wife in the strict sense. Other presidents had affairs but I think they were all broken off by the time they were President.
The president, vice-president and federal judges can be removed from office for committing crimes. First the person must be officially charged with a crime or crimes, this is called impeachment, and then the person must stand trial in the Senate where a conviction requires a 2/3 vote. Members of Congress, however, are not subject to this process.
Herbert Hoover and John F. Kennedy donated their salaries to charity. George Washington didn't want the salary but was convinced to take it because some presidents in the future may need it. George Washington didn't take a salary for leading the Army.
One promise you make when you become president is to uphold the Constitution. Presidents who fail to do so may find themselves removed from office.
Impeachment
The actual term of office as stated in the US Constitution, Article III, is that they shall serve "during good behavior." This means that they serve for life but may be impeached and removed from office if convicted of the same offenses that the President may be impeached and removed for.
As of May, 2012 there have been 11 U. S. Presidents since Harry Truman.
they are removed from office
A governor may be removed from office through impeachment, where the state legislature votes to charge the governor with misconduct, followed by a trial and possible removal if convicted. Additionally, a governor can be removed via a recall election, which allows voters to petition for a special election to determine whether the governor should be removed from office.
You may be thinking of Gray Davis, who was recalled from office by popular vote about a decade ago.
He could die, voluntarily resign or be removed from office via the impeachment process. He could temporarily be removed from office because of an inability to perform his duties.
Recall
The Constitution states that Justices "shall hold their Offices during good Behaviour." This means that the Justices hold office as long as they choose and can only be removed from office by impeachment. Source: The Supreme Court website.
crimes and misdemeanors
Impeached presidents do not automatically lose their benefits; it depends on the outcome of the impeachment process. If a president is convicted and removed from office, they may lose certain benefits, such as their salary and access to certain privileges. However, they typically retain their pension and other benefits unless specifically addressed by Congress. In practice, the specifics can vary based on the circumstances surrounding the impeachment and removal.