"I believed I was not visible on Zoom," he told Vice. "I thought no-one on the Zoom call could see me. I thought I had muted the Zoom video."
Jeffrey Toobin, 60, also a prominent CNN commentator, has been in demand as the US election campaign intensifies.
The incident, first reported by Vice News, happened during an election simulation involving the New Yorker and WNYC radio last week.
Mr Toobin, in a statement to Vice, said: "I made an embarrassingly stupid mistake, believing I was off-camera." more
Spybuster Tip #840:
• Always assume the mic and camera are live, and act appropriately.
Spybuster Tip #841:
• Know how to use your tech.
