His net worth is in the billions. How bad a businessman can he be? And he got it by building things, not through politics.
No. For all the years the democrats have desperately been trying to find SOME dirt on him with which to go after him, they have found NOTHING.
That alone tells me that he did his business dealings with honesty and some level of integrity.
I know he's been accused of less than ethical business moves, but since I never followed him, I have no idea what they were or how true it was.