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There is multiple ways Trump is likely to handle it, and it depend on circumstances right before and after the election.
My best guess is that trump would refuse to concede right up, and even past the inauguration day, but ultimately leave the White House under protest that the election was corrupt, stolen from him by the Deep State that plotted against him, and rigged the election.
He might leave the White House, but he won't ever concede the election. After leaving the White House, Trump is likely to claim he remains the official president of the US. Trump love to be the victim, to create the illusion that he is the under-dog that has been victimized by a corrupt system. He want to be perceived as Robin Hood, the man who exposes and defeats corruption (The Deep State). My bet, he wants to leave office under controversy, so he can be on the outside, claiming he is the true president that was forced out off office at gun point by storm troopers under the control of the Deep State.... He might go as far as to sue the US government for wrongful job termination, claim the US government did not investigate election fraud that caused him to loose.
For as long as Trump is alive, he will also be doing and saying things to keep the spot light on himself. As president, he is on the world biggest stage with the biggest audience. He will never be satisfied with having to play smaller audience once he the country, the media, and rest of world move beyond him.