No president is supposed to serve more than two full terms. That rule became part of the US Constitution in 1951, after President Franklin D. Roosevelt died.

President Donald Trump on Sunday didn't rule out running for a third term, even though it's prohibited by the United States' Constitution, adding that he was "not joking." "A lot of people want me to do it,

The Constitution describes the duties and obligations of the three federal branches of government. If you hear it mentioned today, it's likely part of the phrase "constitutional crisis."

In wide-ranging remarks to “Meet the Press,” Mr. Trump said “a lot of people” wanted him to serve a third term and vowed to impose tariffs on global rivals, according to a transcript of the interview provided by NBC News.

First introduced in 1923, the Equal Rights Amendment has met the requirements for ratification. But its constitutionality is still an open question.

In remarks to NBC News, Trump also said "there are methods which you could do it." Trump would need either a two-thirds vote in Congress or a constitutional convention to serve a third term.

“I don’t know Roberts all that well. I’m not a great fan of his court, but I think he does understand, I suspect, the danger of a president who does not respect the Constitution of the United States and wants more and more power for himself ...

"Trump may not want to rule out a third term but the 22nd Amendment to the Constitution does," one expert told ABC News.