President of Argentina
Under the 1994 constitutional amendment, the President serves for four years, with a possibility of immediate reelection for one more term. However, unlike the President of the United States, in Argentina, a person may be reelected again after serving for two terms and staying out of office for the following term. So after serving for two consecutive periods, the president is not allowed to run for a third consecutive one, but may return for the two following elections and so on. There is no limit for a person to be a candidate if he or she does not win the elections.
2020 United States presidential election
The Twenty-second Amendment to the Constitution states that an individual can not be elected to the presidency more than twice. This prohibits former Presidents Bill Clinton, George W. Bush, and Barack Obama from being elected president again. Former president Jimmy Carter (a nonagenarian), having served a single term as president, is not constitutionally prohibited from being elected to another term in the 2020 election.