UPDATE: CBS News:
Grassley later clarified, pressed by CBS News' John Nolen, that his claim about Mueller's timeline was just based on "all the rumors you hear."
"It's just based upon all the rumors you hear, which probably isn't a very good basis for me saying what I said," Grassley said on Capitol Hill. "But I'm getting tired of for the last 13 months it's been reported every month it was going to come out and I want it out."
Grassley cites "rumors" for belief Mueller's findings will be released within a month (CBS News)
Republican Sen. Chuck Grassley says he expects special counsel Robert Mueller will release a report on the Russia probe "within a month," during a radio interview with Hugh Hewitt.
Former DNI James Clapper explains guessing when Mueller may wrap is a favorite parlor game, and all we can say for sure is the special counsel is closer to the end of his investigation than the beginning.