Yeah, that pesky Constitution again. Johnson could be in a vegitative state and he'd still be able to retain his office. There is no method for removing a sitting senator except through impeachment.
Constitution you say...HA...I thought senators per the constitution we’re to be selected instead of elected? That’s obviously been amended a bit. If an elected senator is unfit to represent his/her state...shouldn’t the governor and legislators of that state have the ability to rectify the problem?