It's a total sham, but since it's gotten this far, I say let both sides call all the witnesses they want, and introduce all the evidence they want.
If the Dems hold true to form, they'll make even bigger jackasses out of themselves in the Senate, than they did when they made up* the articles of impeachment.
Let's hear from Lev Parnas, the most recent flavor of the week from the Dem playbook to try to take down Trump. His testimony ought to be good for a few days of hilarity. Assuming he can get past security with that ankle monitor he has to wear. Hey, what say the Dems call Michael Avenatti?
A recent former flavor of the week from the Dems failing playbook to try to take down Trump. Or, let's go nuclear, and call Stormy Daniels! That would be must see TeeVee; a porn star testifying about the president's junk in the well of the Senate! It just doesn't get any better! Thank you Dems!
Yes, I choose my words wisely. *Made up...