It’s giving "Every move you make, I’ll be watching you."
However, the union's dispute with the train operating companies "remains firmly on".
Sky's Jayne Secker hit back at the RMT boss after he accused her of being a "government mouthpiece".
Royal Mail staff also vote to continue industrial action amid bitter disputes over pay, jobs and conditions.
"If anyone says that's not the case, they are not telling you the truth," the RMT boss told MPs.
Transport secretary Mark Harper hit back: “That’s simply not true."
Did the RMT Union’s general-secretary deliver "low blows" or a "brilliant" takedown of the BBC?
"Richard you're just ranting," the union boss told the ITV presenter.
Strikes are set to go ahead next week although talks will be held with the Rail Delivery Group today.
Four extra days of train disruption to hit last-minute festive travellers.