If they have Biden on tape saying what you claim than why did Trump have to keep pressuring the Ukrainian government to investigate one of his political opponents? And if Trump was doing that, doesn't that constitute an abuse of his power? I would point out Trump was withholding aid for Ukrain and it was only because of bipartisan pressure from both sides that made it happen. I think voters will kick his fat lying corrupt ass out in '20 before he's actually impeached if it's any consolation
