(1 of 3) According to ABA ethics, if Chief Justice Roberts is a material witness, he cannot and should not fulfill his constitutional role and must step aside. He will have one of the biggest conflicts of interest in American history.

(2 of 3) The Constitution does not say "acting" chief justice, so if he must recuse himself and another justice legally and ethically steps into the impeachment proceedings, that justice must become the chief justice.

(3 of 3) If the replacement justice does not become the legal chief justice, then the Senate trial is fatally flawed from the opening gavel. https://www.americanthinker.com/blog/2019/11/chief_justice_roberts_now_dragged_into_democrat_impeachment_process_.html#ixzz663tjEDid