Wouldn't there be a special election, afterwards?
However, I looked it up, and it appears that:
In 37 states, the governor makes an appointment to fill a U.S. Senate vacancy, and the appointee serves until the next regularly scheduled statewide general election. The person elected in that election serves for the remainder of the unexpired term. If the term was set to expire at that general election, the person elected serves a full six-year term. Nine states require the appointee to be of the same party as the vacating senator. Six states have different requirements if the vacancy occurs within a specified number of days, and Utah requires its governor to make an appointment based on a list of three recommended prospects from the party.
In Kentucky it appears that the Governor must pick a replacement that is of the same party as the Senator who is leaving, and there are no other requirements.
Vacancies in the United States Senate
So I stand corrected. As is usually the case, my 50/50 change went against me. That's why I don't bet. 🙂
He would be replaced by a Republican.🙂