Trump pledged to release his tax returns; he didn't. Since he didn't, we don't know the extent of his business holdings and the extent of the possible conflicts of interest he faces. His children are heavily involved in his transition as well as his businesses, which are global in scale. It's very worrying that he's meeting with global officials to discuss what should be US politics, when he and they can potentially use those meetings to push Trump business. That's not good for America, and the electors should insist he divest or withhold their votes.
Trump has expressed a will to avoid putting his businesses in a blind trust and evidently still wants to have a controlling hand. This is contrary to the constitution, according to ethics lawyers who worked for both President Obama and President Bush, who have said that the electoral college ought to reject his presidency if he does not give up his businesses.
No, the Electors should not withhold their vote for Trump unless he agrees to sell his businesses. Their job is simply to vote for one candidate or another. Congress should insist that Trump reveal his business interests and then determine whether he needs to sell them or not. Their investigation should inform the Electors.
I don't see why electors should withhold their vote for Trump unless he agrees to sell his businesses. He will only be president for 4 or 8 years, what is he expected to do after that? I do not understand how having a business will clash with his presidency, surely he can pass it over to his board for the duration of his electorate.