Mountbatten stressed that he would act as the trustee of the princes' commitment, as he would be serving as India's head of state well into 1948. He engaged in a personal dialogue with reluctant princes, such as the Nawab of Bhopal, who he asked through a confidential letter to sign the Instrument of Accession making Bhopal part of India, which Mountbatten would keep locked up in his safe. It would be handed to the States Department on 15 August only if the Nawab did not change his mind before then, which he was free to do. The Nawab agreed, and did not renege over the deal.