How is McConnell able to serve as a Senate ‘juror’?

I am baffled. The U.S. Senate majority leader is seeking to grease a pending Senate trial in favor of the president of the United States.

And this will occur after he takes an oath administered by the chief justice of the U.S. Supreme Court to be an impartial juror.

How does that work?

Mitch McConnell is working with the White House to ensure a favorable outcome for Donald Trump, who’s about to be impeached by the House of Representatives. The Senate will get the matter and will conduct a trial to determine whether Trump should be convicted of two high crimes and misdemeanors: abuse of power and obstruction of Congress.

All 100 senators will serve as jurors in a trial presided over by Chief Justice John Roberts. But how in the name of impartial juris prudence can Majority Leader McConnell perform the duties he will swear he will do if he’s attempting to rig the outcome in favor of the president?

This isn’t how you’re supposed to do it.

I get that the trial isn’t strictly a judicial affair, that it’s tinged with politics through and through. However, there is supposed to be a certain level of judicial decorum involved when the jurors take an oath to judge the evidence fairly and with an open mind.

For the leader of the Senate to work against that very oath is a serious violation of the duties he is supposed to perform.