"Over half" of pub landlords are earning less than £15,000 per year because they are "tied in" to a relationship with a major pub company, according to the shadow minister for pubs.
Labour's Toby Perkins spoke to Daybreak ahead of an opposition debate calling on the Government to do more to protect pubs and their landlords.
"There has been a number of studies suggesting that people who have a pub with one of the big pub companies are going to be earning less than minimum wage.
"Over half of them earn less than minimum wage - and doing long, long hours. So it is really a major issue for those people and it is a big issue for the communities that see those pubs go under."
More top news
The first victim of the Manchester bombing has been named as Georgina Callander, a student from Lancashire.
A 23-year-old man has been arrested in connection with the attack at Manchester Arena last night.
Theresa May says police think they know identity of lone bomber as she contrasts "warped" terrorist with courageous emergency services.