Former Co-op bank chairman Paul Flowers has been arrested in connection with a drugs supply investigation, police said today.
West Yorkshire Police said officers arrested the 63-year-old in the Merseyside area last night and detectives are questioning him at a police station in West Yorkshire.
Mr Flowers, a Methodist minister, was suspended by both the church and the Labour party following allegations that he bought and used illegal drugs.
Mr Flowers stepped down from his role as Co-op bank chairman in June and questions have since been asked about his competence in the role.
He has also been engulfed in allegations of illegal drug use, gay sex, questions over his expenses claims at a drug charity and drink-driving.
It also emerged he had resigned as a Labour councillor after adult material was discovered on his computer.
Co-op bank is seeking to recover contractual payments made to Mr Flowers, and he has been told to hand back £31,000.
"When Paul Flowers relinquished his responsibilities in June, it was agreed, as per his contractual obligations, that his fees for the rest of his period of office would be paid," the bank said in a statement.
An "internal fact-finding review" - looking at emails and other evidence - is being carried out by the bank.
The assistant secretary of the Methodist Conference, the Rev Gareth Powell, acknowledged the risk that allegations against Mr Flowers would "tarnish" the church's reputation.
Mr Powell told the BBC: "I think inevitably some of the speculation has raised questions, as it always does for the church, about the trustworthiness of ministers.
"Inevitably, it's regrettable when the allegations made against one minister then tarnishes the extremely good and honourable work undertaken by all of our ministers.
"Certainly the actions that are now under public scrutiny inevitably raise a question about the role of the church."