My understanding is they have to vote to approve witnesses. Thats why Lindsey Grahamnesty is saying he wont permit Hunter Biden to testify.
Two steps. The first one is pure proceudure, it is allowed by our rules, is it in order to vote on witnesses at all?
If yes, then will be motions for witnesses. The deals will be made in the back rooms. This is entirely opaque to the public. The sentators will do the usual lie and smile thing.
There is no way a witness will be allowed, that could damage a senator. Impssible. These crooks make themselves untouchable, and put themselves on a pedastal.