Just to clarify, does the Senate already have a method of censure/expulsion? Because I cant imagine such penalties, if new, can be applied retroactively to prior conduct.
Expulsion does exist indeed, censure would be the new addition. Normally I very much oppose retroactive use, but I do think this is one of few cases in which there is an argument for it. Now, if the Senate is strongly of the opinion only the current punishments in place (expulsion) are the ones that should be used, then I will defer to the opinion of my colleagues and pursue expulsion if necessary.
If one of these two senators in question wins re-election would you wait until the start of their second term to begin any disciplinary action?