What if Biden or Trump won't admit defeat?

It is the night of the US presidential election –  a long day where anticipation and caution reigns over the most divisive election races in several decades.
The US Supreme Court topped President Trump’s attention in the last hours before the U.S. presidential election, as Trump stressed the necessity of declaring a winner on Tuesday, refusing to wait days or weeks.
But what if Donald Trump or Joe Biden do not admit defeat in the election race? Would an American nightmare scenario begin for a disputed election?
Despite that expected scenario, much of all of this could be avoided if Americans are willing to wait for the election result. But how long is the wait? This is the most important question.
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