If he chooses, he can legally run his business while still serving as President. There would be no conflict of interest because it is legal for him to do that. However, so there will not be an appearance of a conflict of interest, he is turning the businesses over to his children. Good Lord, you all vetch when you thought he was going to keep his businesses in his name and now that he is not, you are kvetching about that. There is no pleasing a whiny liberal.