I think it's interesting that you think the DOJ is biased against Republicans. The DOJ unlike say the EPA is a conservative department. I think Mueller is doing an exemplary job, under trying and unusual circumstances. Remember, Trump has gone on record stating that he would NOT have promoted sessions to his post, had he known that he was going to recuse himself for the investigation, and asking him to intervene. Trump has already fired Comey, and wants to fire Rodenstein and Mueller if he can figure out a way to do so. So I'm glad the DOJ has your complete support to follow the money and conduct this investigation to its conclusion.
Oops I posted the above based on your previous post "I welcome the investigation" I guess, you didn't really mean that, if you want to wrap up an investigation that that has more indictments, at a more rapid pace, than any other investigation of its kind (including Watergate).
Remember, Clinton got impeached because they started an investigation looking for something, anything on him, and ended with him get impeached for lying about getting a blowjob in the White house. That is the bar Republicans have created. So, sorry, Trump, who doesn't want to release his tax forms, never divested or even reduced his conflicts of interests before becoming a president, so far refuses to answer any questions under oath. Those things would clear things up more quickly. Or, we can do it the hard way.