Julia Hartley-Brewer had a heated debate with Rail, Maritime and Transport Union boss Mick Cash this morning over news of fresh strikes on the London Underground.
Tube staff have voted to strike over separate disputes about safety, staffing and industrial relations. It is thought that the strikes will take place in the run up to Christmas.
Cash defended his members' position by telling Julia that tube operators are "struggling with the amount of people coming through" and suggesting staff are "worried that there’s more cuts coming as the Mayor is under pressure to reduce the budget."
However Julia had little truck with Cash's claims, at one point suggesting "it's all about money with you, isn't it?" and adding that RMT members go on strike "every 20 minutes."
The interview ended with Cash, whose union has weathered heavy criticism this year, complaining that Julia's comments were "slurs" against him and his members.
Listen to the full interview to find out more