SDLP Leader Colum Eastwood has commented on the revelations broadcast by BBC Spotlight on Tuesday night.
The programme unveiled secret recordings alleging a circle of corruption involving the sale of the Nama property portfolio in Northern Ireland.
Businessman Frank Cushnahan was recorded receiving £40,000 in cash from a property developer whose portfolio was in the hands of Nama.
Cushnahan was arrested several months ago by officers from the National Crime Agency.
He denies any wrongdoing.
The Foyle MLA said: “The revelations in the Spotlight programme allege a circle of corruption involving certain individuals in the business community, some of whom had links to government figures.