It's no ones business! If the candidates want to release that information then it's up to them. A better bill would be to require every member of congress to show how much we are actually paying them. There is a reason that some of these fools have never had a job before and don't come from rich families yet have somehow gotten very rich while in office. How can Biden afford that mansion of his on a senators salary? How did Sanders afford the big expensive house he just bought?