The governor of Iran’s Central Bank said that Iran expects the US government to reinstitute limited access to the US dollar to facilitate Iran’s financial transactions with the rest of the world and fully implement the recent nuclear deal.

The comment by Valiollah Seif, in a lengthy and detailed interview with Al-Monitor April 14, sets up a potential confrontation with the Barack Obama administration that could undermine the agreement Iran reached with the United States and five other world powers last year.

Under the deal, known as the Joint Comprehensive Plan of Action (JCPOA), Iran agreed to curbs on its nuclear program in return for what Seif called “effective implementation of the agreement in such a way that Iran’s economic and business activities will be facilitated.” This includes, Seif said, what is known as the U-turn: Transactions that must be cleared through a US financial institution even though the money does not stay in the US bank.

Such brief contact with the dollar is customary when currencies such as the Indian rupee are converted into euros; the dollar is used in pricing the conversion. Iran would like to employ the U-turn to gain easier access to some $100 billion in foreign reserves that had been frozen in Asian banks prior to the JCPOA.