Jake Tapper, CNN’s august and outwardly civil newsman, blew up at his staff during a commercial break last week after they botched airing a series of clips on his show The Lead, a reliable CNN production source told Mediaite.

During last Tuesday’s broadcast, Tapper — who had just returned from Helsinki — covered President Donald Trump‘s ever-changing explanation for his press conference with Russian President Vladimir Putin in which he cast doubt on US intelligence that the Kremlin was behind meddling in the 2016 election.