Governor Steve Beshear says he appointed Williams to a Circuit Judgeship because he was the best qualified choice.
The Governor spoke out about the appointment Wednesday.
He announced the appointment last Friday after a panel recommended Williams and two other names.
The 40th Circuit post opened up in September after the death of Judge Eddie Lovelace.
As Senate President, Williams has been a nemesis to the Governor in the past.
Williams has opposed parts of the Governor's agenda, including expanded gambling.