AHAHAHAHAHAHAHAHAH H-holy shit, you actually believe this. McConnell and Graham have already said they are looking to not be impartial, want this over as fast as possible, are working with the White House, and will already vote in defense of Trump. Not to mention there's already been a threat by Trump that "heads will roll" if you go against him.
But sure, if you ignore all that, live in a different reality where the sky is green and giraffes are made of chocolate, and think Trump is always telling the truth then of course you'd think the Senate would be fair.