Good Morning Britain viewers took to social media to make a demand after Mick Lynch was interviewed by Kate Garraway and Paul Brand during Thursday's show.
The Rail, Maritime and Transport (RMT) union boss appeared via video link, live from the picket line outside Euston station. Rail services across the country have ground to a halt during the latest strike, in a bitter dispute over jobs, pay and conditions.
Further industrial action will take place on Saturday (August 20).