If they do a secret vote than people should make it clear that any CONVICT votes will be assumed to be from THEIR senator and they will be fired for it. Mitt Romney could be the only one to vote to convict and in a secret ballot I’ll assume that it came from every single one of them and primary them all.
Murkowski is a likely convict vote, she has done a bunch of nefarious stuff, yet Alaskans continue to send her back, it is much like Manchin in WV.