There will be witnesses that are pertinent to the charges, each one has to be voted on, to appear.
If Hunter Biden testimony is pertinent, then he'll be voted on.
He is not on trial though, he also did not make an accusation against Trump that Trump is being charged with, Hunter has not been charged with anything illegal by our DOJ or by the Ukraine.
HOW can Hunters appearance even help Trump in his defense of his articles?
The manager's witnesses are pertinent, and necessary to figure out the truth.
The Senators will never vote on a circus......unlikely you'll get the 51 +, but go for it, for all I care, if the law allows it...... Nothing he can say can help Trump get off for his high crimes.... He really should prepare for a real defense of the charges instead of trying to use his impeachment trial to smear the Biden's..... he's acting like THE FIX IS IN for his acquittal, so why not just use the trial, to score some smearing points against his opponent's family....
Again, HOW can Hunter testifying help him get acquitted???