He may have some or many Conflicts of Interest with his position. Who he has business relationships with, that he may want to use his position to Awesome Chill Out I Came To Party Grim Reaper Halloween tshirt do favors for. He may want to hide any manipulation and or theft he might do as president. If no one knows how much he actually had when he started, they have no way of knowing how much he added as a result of his position as president. He may have misrepresented his wealth, business interest and influence to mislead the American voters. And their are probably more, but there may possibly be none.