As Monty noted, I have little or no doubt that Trump will continue his bid for a second term. He was the underdog in 2016 and I suspect he believes that he can repeat that performance yet again. He is NOT a scientific campaigner; he goes with his gut.
That said, if he DOES drop out prior to the convention, then the delegates would be committed to vote for him anyway on the first ballot. He would then be offered the nomination. Were he to refuse, it would go to open balloting on the floor.
If he has been nominated and has accepted, but then drops out after the convention has been adjourned, the RNC committee members would meet to decide a new nominee voting, the for the appropriate number of delegates in their jurisdiction by proxy (no re-assembly of the convention would be made). They would be free to choose whomever they saw fit as long as a majority of those proxy votes supported the nomination and that nominee agreed to run.
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