The accused is the bar owner, named Donald.
Witnesses identify Donald as the shooter. The shooting is described as unprovoked. The dead man was a patron who upon asking if the barkeeper could put the Notre Dame game on the TV (in lieu of NASCAR), was shot dead in cold blood by Donald.
Employees of the bar tell police that inside surveillance camera footage completely captures what happened with audio and crystal clear video quality.
Witnesses testify before the Grand Jury, recounting the events of the murder.
In your nonsensical “point of order” world, Court issued search warrants and subpoenas would have no lawful authority. In your world, Donald would be free to bury the camera footage. In your world, Donald would be able to strike any witnesses from testifying at trial, forcing the prosecution to try him with zero witnesses, and then argue to the Court that the murder case be dismissed as no witnesses have testified against him.
For the record, the Impeachment Articles and evidence gathered during House hearings, provide ample evidence to make their case. It is for that reason why Mitch wants to bury all evidence and testimony.
Link: https://intelligence.house.gov/uploadedfiles/in_re_president_trump_house_impeachment_trial_brief_and_sof_1.18.20.pdf