Encourage him. Every time Bill opens his mouth it serves to remind people how much they hated having him and his wide load accomplice in the White House. She knows what he is doing and can't do anything about - publicly. He knows what he is doing because it wouldn't do anything for what he thinks his legacy is to see her elected president.
This is just another in a series of a thousand cuts.
How long did it take for the soiling of an intern's blue dress take to be reported?