Grant Shapps
"We need mass rallies, we need people on the streets, we need protests in every town and city in Britain," the union boss said.
"Just because you've explained it to me several times Mr Shapps it doesn't mean your point is necessarily valid."
RMT accuses transport secretary of "inflaming tensions" over walkout set for next week.
The transport secretary also accused the aviation industry of cutting too many jobs during the pandemic.
The transport secretary clashed with the BBC's Sophie Raworth after she asked him why the prime minister was booed.
Transport secretary suggests Boris Johnson dropped by to thank a staff member at the "end of a busy day".
The transport secretary said he was "not an absolutist" when it came to preventing civil servants from working from home.
One Twitter user even asked: "Is this a real video?"
The transport secretary insisted the prime minister is "mortified" at breaking his own lockdown rules.
The transport secretary offered to take in a woman, her 75-year-old mother, her son and their dog more than five weeks ago.