Donald Trump is joining a small group of US presidents who have lost the election while in the White House.
The last time this happened was in 1992, when President George HW Bush was denied a second term by Bill Clinton.
Eight years later, incumbent Vice-President Al Gore was defeated by another Bush.
We speak to two men who were there for the transitions.
Video by Chloe Kim
Please subscribe HERE http://bit.ly/1rbfUog
Video published on YouTube by BBC News.