Isn't it true though, that trump was legitimately voted in for 8 years. If an incumbent is produced that can beat the president in a legitimate race after 4 years, then that incumbent can become the president.

However, if the race is shown to be illegitimate in any way, the incumbent has not excercised his right to become the new president, and the president who has ALREADY been elected for those 4 years will continue to preside?