Two men have been held for allegedly supplying drugs to ex-Co-op chairman Paul Flowers.
Flowers, a former Methodist minister and Labour councillor, was filmed allegedly paying £300 for cocaine and discussing buying other illegal drugs.
He was suspended by both the church and the Labour Party following the allegations.
A West Yorkshire Police statement said: “As part of an ongoing investigation into allegations of drug supply offences made in a national newspaper, West Yorkshire Police have today arrested two men aged 26 and 34.
“The 26-year-old was arrested at an address in the Thornton area of Bradford and the 34-year-old detained at an address in the Armley area of Leeds. They are being questioned at separate West Yorkshire Police Stations.
“A 63-year-old man arrested on 21 November in the Liverpool area, in connection with the same incident, is currently on bail.”