Ben Elton dubbed Rishi Sunak a “mendacious narcissistic sociopath” during an “extraordinary” rant on the BBC’s flagship politics show.
The Left-wing comedian launched his one-minute and 40-second tirade on Sunday With Laura Kuenssberg.
MPs blasted the BBC for not halting the onslaught.
Elton let loose in response to an interview with the Prime Minister, in which Mr Sunak urged Britons to hold their nerve on interest rate rises and defended his record while Boris Johnson’s chancellor.
The comedian branded the PM’s responses an “extraordinary Orwellian, meaningless, evasive word salad”.
READ MORE: BBC bosses accused of ‘collusion’ with Sadiq Khan to silence ULEZ criticism
Elton added: “I sort of believed maybe he’s kind of a bit more decent, and it turns out, he’s as much of a mendacious, narcissistic sociopath as his previous boss.
“He seemed to be making a principle of the fact that he resigned from a government that he’d served loyally and tried to keep propped up for numerous years.
“He’s trying to boast about having worried about inflation while he was chancellor under Johnson.”
The 64-year-old, who appeared on the panel alongside former Conservative special adviser and pollster Luke Tryl and activist Marina Litvinenko, went on: “He’s the Prime Minister.
“He owes us honesty but we got nothing but mendacity, evasion and vanity, just dripping with vanity.”
Tory MP Peter Bone said he “didn’t understand why Laura Kuenssberg didn’t interrupt”.
He added: “To say it was extreme and unjustified and rude is mild. But where was the balance from the BBC?
“Where was somebody jumping in and putting the other side of the coin? It was extraordinary.”
Mr Bone said: “Giving these people a platform when they just have extreme political views but don’t run a campaign, aren’t representative of a party and haven’t been elected to anything seems to me making a mockery of what’s supposed to be perhaps the BBC’s premier politics programme.”
A Tory source said: “It’s no surprise people are switching off the BBC. The Beeb should reread its own impartiality guidelines and stop stitching up its political panels.”
Host Laura Kuenssberg made clear Elton has “never been a fan of the Conservatives” as she asked for his take on the interview.
The BBC said: “We feature a wide range of guests and opinions across the series and ensure we meet our due impartiality commitments.”