On 22 February 1530 — again by papal provision — Tunstall succeeded Cardinal Wolsey as Bishop of Durham. This role involved the assumption of quasi-regal power and authority within the territory of the diocese. In 1537 he was also made President of the new Council of the North. Although he was often engaged in time-consuming negotiations with the Scots, he took part in other public business, and attended parliament, where in 1539 he participated in the discussion on the Bill of Six Articles.