He questioned why Lynch chose the period and suggested January would be a better time to strike.
He continued: "You are going to be putting people out of business who run hotels, who run restaurants, who run bars and retailers. This is the time of year when they make money and you are robbing them of their income for the coming year."
Lynch's response was classically scornful. "It isn't Christmas yet, Richard, I don't know when your Christmas starts but mine starts on Christmas Eve", he said.
Madeley said Lynch was being "disingenuous" and insisted "commercial Christmas" starts in December.
"Don't be ridiculous," he continued. "I won't let you get away with nonsense", he added after Lynch accused him of "ranting".
Madeley said he was holding Lynch "to account" and the pair continued to bicker until Lynch explained the latest strike action was in response to decisions taken by Network Rail in December and that they will strike when there will be "no passenger services running" because it is closed over Christmas anyway.
He also said they gave three weeks notice for the strikes.
\u201c'Will you answer the question Mr Lynch, I won't let you get away with nonsense'\n\n@richardm56 grills the General Secretary of the RMT, Mick Lynch over striking over the Christmas period\u201d
— Good Morning Britain (@Good Morning Britain)
The RMT has rejected Network Rail's latest pay offer of a 5 per cent increase this year and a 4 per cent rise in 2023. It will strike on days this week and further dates leading up to Christmas.
Lynch described the deal as "substandard".
As for when Christmas becomes Christmas... what a bizarre argument to have on TV.
Things didn't get much easier for Lynch when during his appearance on Radio 4's Today Programme when he received pushback from Mishal Husain after accusing the BBC of "parroting Tory propaganda."
\u201cMick Lynch from the @RMTunion calling out the BBC for repeating govt propaganda and the attack lines used by the right wing press.\ud83d\udc4f\ud83d\udc4f\ud83d\udc4f #r4today\u201d
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