Howard Stern launched into a blistering attack on Jay Leno on Piers Morgan's new talk show on CNN Tuesday night.
The Sirius radio jock -- who's lashed out The Tonight Show host in the past -- told Morgan: "He's not fit to scrub David Letterman's feet."
Stern repeated his previous claims that Leno steals jokes. "Jay is insane. And Jay is a crook. And the world knows exactly what he's up to. He steals a tremendous amount of material," Stern said, adding "this guy's ripped off like 10 major things from my show."
Stern then vented on the late night audiences: "I don't know how Leno has beaten David Letterman in the ratings... America must be filled with morons who at night lay in bed... the ones who are watching him, they must be in a coma."
In March, Stern told CBS' Early Show, "Just the mere mention of Jay Leno's name makes me want to vomit." He claims Leno stole one of his sketches featuring a chicken that predicts football wins.
Piers Morgan Tonight weeknights on CNN at 9pm ET/PT