This is not addressed not to those Republicans who think Donald Trump is an appropriate kind of person to be President of the United States. If you like what you see, go ahead and vote for him.
It is addressed rather, to those Republicans who have regarded Mr. Trump unfavorably because they saw him as lacking the character and temperament necessary for our nation's highest office. (Reports indicated not so long ago that quite a few Republicans felt that way.)
I would like to ask those Republicans: Given what you saw about your party's nominee, can you now vote for him?
Three reasons occur to me why you might.
1) As you've seen more of Trump, you've changed your mind about what kind of person he is.
This would surprise me, as his conduct has been rather consistent. Although some expected Trump would shift toward acting "presidential" once he had the nomination sown up, he has done nothing of the sort. So why would anyone change their mind?
2) Supporting your party's nominee is a matter of party loyalty.