Jim Reeves, from the Communication Workers' Union, says the argument to close 70 Crown Post Offices is flawed because the business is profitable.
He spoke to ITV News Central outside the Kings Heath branch in Birmingham as staff went of strike this morning.
More top news
Nosakhere Stephenson, known to his contacts as ‘Nosa’, is one of 18 men who were implicated in the supply of guns and ammunition
Heading to the shops on Black Friday? Help us tell the real story of the day by letting us know your experience.
The biggest shopping day of the year is almost upon us, so what is Black Friday and how can you get the best deals?