DuncinToffee
The Republicans might be worried about what else Herrera Beutler might disclose, so think that entering the interview as evidence is the lesser of the evils.
There's also a chance others could be considering following her lead and disclosing damaging information.
The question is whether there is anything that could change the Republican Senators minds about how they will vote, as they seem very clear of how they will vote currently. It would have to be a bombshell.