Murkowsky, Romney, Collins. IMO
I think in order of probability
1. Murkowski - I think she thinks she has sufficient independence of the base to get away with it plus her Kavanagh behavior.
2. Collins - She might to prove she has enough “wokeness” to make up for he defense of Kavanagh
3. Romney - I don’t think he will. He’ll bluster, threaten to the vote. He’ll vote no.