In the Clinton trial, it was made clear that the Senators were both judge and jury.
Rules are decided by a majority. If 51 Republican Senators stick together, McConnell will have a lot of power in devising the rules.
I promise I will deal with it more fully later.
Rule 7 of the Senate Rules gives us most of the meat. Basically, the Chief Justice directs all forms of the proceedings, making sure the rules . . .
Remember that Senate trials play mostly in the Court of Public Opinion, by design.
The framers of the Constitution considered giving impeachment trials to the Supreme Court, but instead gave it to Congress.
Roberts can do a lot to direct the hearing. If the Republicans insist on a sham trial, how he responds can do much to shape public opinion.
I'll try to expand more and answer more questions tomorrow.