The only logical solution, since this is a trial, is to recuse 4 of the "jurors" since it is in their own best personal interest not to have to run against Donald Trump in November. It's all for the purpose of fairness and transparency, after all.
What happens if a tie?
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it goes to trial by unarmed combat. And Trump has already contracted the top 10 MMA heavyweights as the President’s Judicial Champions.