With the end of the Trump presidency in sight, observers are wondering whether he will seek his old job in 2024. It’s too early to know; Trump himself probably doesn’t even know yet.

But this much is certain: Ex-presidents running for another term are exceedingly rare. And the last time it happened, the public witnessed sheer political drama. It was the only time that three presidents (the immediate past, the current, and the next one) all ran at the top of the ticket in the general election.